If you’re weighing Alliance HR against Optimum Employer Solutions, you’re probably already past the “what is a PEO?” stage. You know what co-employment is, you understand the general value proposition, and now you’re trying to figure out which provider actually fits your business — not just which one has the slicker sales deck.
Both providers serve overlapping markets but differ in meaningful ways around pricing structure, service depth, geographic reach, and how flexible they are when you want to make changes. Rather than giving you a thin two-provider comparison, we’ve expanded this list to include six other PEO providers that compete in the same space. That way you’re evaluating the full landscape, not just two options.
Every provider below is assessed on the factors that actually matter during a buying decision: cost transparency, service scope, ideal company size, and where they tend to fall short. If you want a deeper primer before diving in, check out our foundational guide on professional employer organizations.
1. Clicks Geek PEO
Best for: Business owners who want objective, side-by-side PEO comparisons before committing to a provider.
Clicks Geek PEO is an independent PEO comparison platform built to help business owners evaluate providers clearly, without the noise of affiliate bias or sales pressure.
Where This Tool Shines
Most PEO comparison resources are either produced by the PEOs themselves or by affiliate sites that earn commissions on referrals. That creates an obvious conflict of interest. Clicks Geek PEO operates differently: it’s an independent platform focused on giving you transparent pricing analysis and honest provider breakdowns so you can make a decision based on your actual situation.
This is especially useful if you’re approaching a renewal and suspect you’re overpaying, or if you’re comparing two providers (like Alliance HR and Optimum) and want a structured way to evaluate the differences without relying on each company’s own marketing materials.
Key Features
Side-by-Side Provider Comparisons: Compare multiple PEO providers across service scope, pricing structure, and contract terms in one place.
Transparent Pricing Breakdowns: Understand what’s bundled, what’s a-la-carte, and where administrative markups tend to hide.
Independent Evaluations: No PEO affiliation means no incentive to steer you toward a specific provider.
Contract Term Reviews: Understand what you’re agreeing to before you sign, including exit clauses and renewal terms.
Educational Resources: Useful for first-time PEO buyers who need context before jumping into provider negotiations.
Best For
Business owners actively comparing PEO providers, CFOs reviewing renewal terms, and operations managers who want cost clarity before signing or re-signing. Particularly valuable if you’ve been with a PEO for a few years and haven’t benchmarked your pricing recently.
Pricing
Free to use. The comparison resources and provider evaluations are available at no cost, with no obligation to purchase or switch providers.
2. Alliance HR
Best for: Smaller businesses that want direct access to HR advisors and a relationship-driven service model.
Alliance HR is a regional PEO provider that emphasizes hands-on HR consulting and direct account team access over technology-first automation.
Where This Tool Shines
Alliance HR’s core differentiator is accessibility. Smaller business owners often get lost in the ticketing queues of larger PEOs. Alliance HR leans into the opposite model: direct relationships with dedicated consultants who know your account. For companies with 10 to 75 employees that want a real person on the phone when something goes sideways, that matters.
The tradeoff is that their technology platform isn’t as polished as newer, venture-backed competitors. If you need a sleek self-service portal or complex integrations, you may find the tools limiting. But if hands-on service is the priority, Alliance HR delivers on that positioning.
Key Features
Dedicated HR Consultants: Direct access to HR advisors rather than routing through a general support queue.
Payroll Processing and Tax Administration: Standard payroll services with tax filing handled on the employer’s behalf.
Employee Benefits Administration: Access to group health, dental, and vision plans through the PEO’s coverage pool.
Workers’ Compensation Management: Coverage and claims handling through the PEO’s workers’ comp program.
Compliance Guidance: HR compliance support tailored to smaller employer situations.
Best For
Small businesses with under 75 employees that prioritize relationship-based service and direct HR advisor access over advanced technology features. A reasonable fit for companies in their first PEO engagement who want support through the learning curve.
Pricing
Custom quotes based on headcount and selected services. Contact Alliance HR directly for pricing. Expect a per-employee or percentage-of-payroll structure, though specifics aren’t published publicly.
3. Optimum Employer Solutions
Best for: Growing companies that need scalable HR infrastructure with flexible contract terms.
Optimum Employer Solutions is a PEO that positions itself around flexibility and scalability, targeting companies that are growing and don’t want to be locked into rigid service structures.
Where This Tool Shines
Where Alliance HR leans on relationship depth, Optimum leans on adaptability. Their contract structures are designed to accommodate companies that are scaling headcount or changing service needs without forcing you through a full renegotiation every time. That’s a real operational advantage for businesses in a growth phase.
The technology layer is more developed than what you’d find at a smaller regional PEO. Employee self-service tools and onboarding workflows are built into the platform, which reduces administrative friction as your team grows. The tradeoff is that the relationship may feel less personal than a boutique provider like Alliance HR, particularly at lower headcounts.
Key Features
Scalable HR and Payroll Platform: Infrastructure designed to grow with your headcount without requiring a platform switch.
Flexible Contract Structures: Adaptable terms without long lock-in periods, which reduces risk if your needs change.
Large-Group Benefits Access: Access to competitive health insurance plans through the PEO’s pooled coverage.
Risk Management and Safety Programs: Workplace safety support and risk mitigation tools included in service packages.
Technology-Driven Onboarding: Digital onboarding and employee self-service tools that reduce HR admin time.
Best For
Companies in the 25 to 150 employee range that are actively growing and need a PEO that won’t become a bottleneck. Also a good fit for businesses that have outgrown a relationship-first provider and need more infrastructure.
Pricing
Custom pricing based on company size and selected service package. Request a quote directly through their site. Pricing isn’t published, which is standard for this market segment.
4. Justworks
Best for: Startups and lean teams that want transparent, flat-rate pricing and fast setup.
Justworks is a modern PEO built around pricing clarity and ease of use, with a clean platform and a per-employee fee structure that makes budgeting straightforward.
Where This Tool Shines
Justworks stands out in a market where pricing opacity is the norm. Their flat per-employee-per-month model means you know exactly what you’re paying before you sign. For founders and small business operators who’ve been burned by surprise fees or confusing PEO invoices, that transparency is genuinely valuable.
The onboarding process is fast, and the platform is clean enough that employees can navigate it without hand-holding. The main limitation is that Justworks is built for simplicity, which means it may not have the depth of HR support or benefits customization that larger or more complex businesses need.
Key Features
Flat Per-Employee Pricing: Predictable monthly cost with no percentage-of-payroll surprises.
Modern Platform Interface: Clean, easy-to-use dashboard for both employers and employees.
Large-Group Health Insurance Access: Competitive health, dental, and vision options through the PEO’s coverage pool.
Automated Compliance and Payroll: Payroll runs automatically with compliance checks built into the workflow.
24/7 Support: Around-the-clock support with relatively fast response times compared to traditional PEOs.
Best For
Startups, tech companies, and small teams with 5 to 100 employees that value pricing transparency and want a low-friction PEO setup. Less suited for companies with complex benefits needs or industry-specific compliance requirements.
Pricing
Starts at $59 per employee per month for the Basic plan. The Plus plan, which includes benefits, starts at $109 per employee per month. One of the few PEOs with published pricing.
5. Paychex PEO
Best for: Companies that need enterprise-grade compliance infrastructure and a broad service menu.
Paychex PEO is one of the largest PEO providers in the country, offering comprehensive HR administration, deep compliance capabilities, and a wide range of service options for businesses at various growth stages.
Where This Tool Shines
Scale and compliance depth are where Paychex earns its position. If your business operates across multiple states, has complex payroll scenarios, or needs robust regulatory support, Paychex has the infrastructure to handle it. They’ve been doing this long enough that most edge cases aren’t new to them.
The flip side is that larger providers often come with more bureaucratic service experiences. You’re less likely to have a single dedicated advisor who knows your account deeply, and navigating support can feel impersonal compared to smaller regional PEOs. For straightforward operations, the full Paychex infrastructure may also be more than you need.
Key Features
Comprehensive Payroll and Tax Filing: Full-service payroll with federal, state, and local tax administration.
HR Administration with Dedicated Specialist: Assigned HR specialist for ongoing support, though depth of access varies by plan.
Multi-State Regulatory Compliance: Strong capability for businesses operating across state lines.
Workers’ Comp and Risk Management: Integrated workers’ compensation coverage and claims management.
Retirement Plan Administration: 401(k) and other retirement plan options available through the PEO.
Best For
Mid-sized businesses with 50 to 500 employees, multi-state operations, or complex compliance requirements. Also a reasonable fit for companies that want a single vendor handling payroll, HR, and benefits under one roof.
Pricing
Custom quotes based on headcount, industry, and service tier. Paychex doesn’t publish PEO pricing publicly. Expect pricing to reflect the breadth of services included.
6. Insperity
Best for: Mid-market companies that want premium benefits access and a full-service HR team.
Insperity is one of the most established PEOs in the country, with over 30 years of operation and a strong reputation for benefits quality and dedicated service teams.
Where This Tool Shines
Insperity’s benefits packages are consistently cited as a competitive differentiator. Their access to Fortune 500-caliber health insurance plans is a real draw for mid-market companies trying to attract and retain talent without the buying power of a large corporation. If competitive benefits are central to your hiring strategy, that’s worth taking seriously.
They also invest meaningfully in HR infrastructure: performance management tools, training resources, and compliance support are built into the service rather than bolted on. The tradeoff is cost. Insperity is generally positioned at a higher price point, and their sweet spot is companies with 50 or more employees. Smaller businesses may find the cost structure harder to justify.
Key Features
Fortune 500-Caliber Benefits: Access to large-group health, dental, vision, and supplemental plans typically unavailable to smaller employers.
Dedicated HR Service Team: Each client is assigned a dedicated team rather than a single point of contact, providing broader coverage.
Performance Management Tools: Built-in tools for employee reviews, goal tracking, and development programs.
Comprehensive Compliance and Risk Management: Employment law compliance, HR audits, and risk mitigation support.
30+ Year Track Record: Operational stability and institutional knowledge that newer PEOs can’t match.
Best For
Companies with 50 to 500 employees that prioritize benefits quality, want a full-service HR team, and are willing to pay for premium service. Less practical for very small businesses or those with tight margins.
Pricing
Custom pricing only. Insperity is generally considered a premium-tier PEO. Contact them directly for a quote, and be prepared for pricing that reflects the depth of their service model.
7. CoAdvantage
Best for: Blue-collar, high-turnover, or workers’ comp-intensive industries like construction, staffing, and manufacturing.
CoAdvantage is a PEO with a clear specialty: industries where workforce risk, high turnover, and workers’ compensation exposure are real operational concerns.
Where This Tool Shines
Most PEOs are designed with white-collar or mixed workforces in mind. CoAdvantage is built differently. Their experience with high-risk industries means they understand the workers’ comp dynamics, safety program requirements, and compliance nuances that general-purpose PEOs often handle poorly. For a construction company or a staffing firm, that industry fluency matters.
Their risk management and workplace safety programs are more developed than you’d find at a generalist provider. If workers’ comp claims are a recurring cost driver for your business, a PEO with genuine expertise in that area can make a meaningful difference in how claims are managed and what your rates look like over time.
Key Features
Workers’ Compensation Specialization: Deep experience managing high-risk workers’ comp environments across multiple industries.
Risk Management and Safety Programs: Structured workplace safety programs designed to reduce incident rates and claims frequency.
Payroll and Tax Administration: Standard payroll processing with tax compliance for variable workforce structures.
Industry-Specific HR Compliance: Compliance support that accounts for the regulatory environment in blue-collar industries.
High-Turnover Workforce Models: Infrastructure designed to handle frequent onboarding and offboarding without breaking down.
Best For
Construction companies, staffing agencies, manufacturers, and other businesses with high physical risk, frequent workforce changes, or significant workers’ comp exposure. Not the right fit for office-based businesses with low risk profiles.
Pricing
Custom quotes that reflect industry risk profiles and claims history. Workers’ comp-intensive industries will see pricing that accounts for that exposure. Contact CoAdvantage directly for an accurate estimate.
8. Oasis (Paychex)
Best for: Mid-market companies with multi-state operations that need compliance-heavy HR support.
Oasis is a PEO that now operates under the Paychex umbrella, known historically for its compliance-focused service model and multi-state regulatory expertise.
Where This Tool Shines
Oasis built its reputation on compliance depth, particularly for companies navigating complex multi-state employment situations. Since being acquired by Paychex, it now operates with the backing of a much larger infrastructure while retaining some of the compliance-specific focus that made it a go-to for certain mid-market companies.
If you’re operating in multiple states and dealing with varying employment laws, leave requirements, and tax jurisdictions, Oasis’s regulatory expertise is a genuine asset. The Paychex backing also means you’re not relying on a standalone provider’s financial stability. The tradeoff is that post-acquisition, the service experience has become more similar to Paychex broadly, which means the boutique compliance focus may be less distinct than it once was.
Key Features
Multi-State Compliance Management: Regulatory expertise across state employment laws, leave policies, and tax requirements.
HR Administration with Regulatory Focus: HR support oriented around compliance risk rather than just operational convenience.
Benefits Administration and Enrollment: Group health and ancillary benefits administration with enrollment support.
Payroll Processing with Tax Compliance: Full payroll service with multi-jurisdiction tax filing.
Paychex Infrastructure Backing: Access to Paychex’s broader resources, technology, and financial stability.
Best For
Mid-market companies with 50 to 300 employees operating across multiple states, particularly those in regulated industries where employment law compliance is a high-priority concern.
Pricing
Custom pricing through Paychex. Contact Paychex directly and ask specifically about Oasis-branded service packages to understand what’s included versus what falls under the standard Paychex PEO offering.
Which Provider Actually Fits Your Situation
Here’s the honest summary: Alliance HR and Optimum Employer Solutions serve the same general market but with different operating philosophies. Alliance HR is the better fit if you want a relationship-driven service model and direct advisor access at a smaller scale. Optimum makes more sense if you’re growing and need flexible infrastructure that won’t require a full platform switch in 18 months.
Beyond those two, the right choice depends on what you’re actually optimizing for. Justworks wins on pricing transparency. Paychex and Insperity win on scale and compliance depth. CoAdvantage is the clear choice for high-risk industries. Oasis is worth considering if multi-state compliance is your primary concern.
What most business owners get wrong is treating a PEO renewal as a formality. Many companies overpay for years simply because they never benchmarked their current provider against the market. Bundled fees and administrative markups are common, and they’re rarely visible without a structured comparison.
Before you renew your PEO agreement, compare your options. We break down pricing structures, service scope, and contract terms across providers so you can make a decision based on real numbers, not sales presentations. The comparison is free, and most business owners find at least one meaningful gap in what they’re currently paying for.