For a mid-size CPA firm doing complex federal and state tax research, the “best” platform usually depends on whether you want the strongest authoritative content, the best state coverage, or the best value/workflow. That said, the two most commonly top-tier choices are:

Best overall for complex tax research

Thomson Reuters Checkpoint
Strong point for a CPA firm that needs:

• deep federal and state tax authority
• good editorial explanations
• reliable research workflow
• integrated tax news, forms, and primary sources

Best if you want the most robust research + practice integration

CCH AnswerConnect / CCH IntelliConnect
Often preferred for:

• very strong state tax research
• practical guidance and explanations
• integration with CCH tax software
• excellent coverage across tax, accounting, and compliance topics

Also worth considering

Bloomberg Tax

• Excellent for complex technical tax analysis
• Very good federal tax content and tax alerts
• Often strong for firms that value breadth and depth of expert analysis
• Can be pricier and may feel less integrated with CPA workflow than CCH/TR depending on your stack

LexisNexis Tax

• Strong legal-style research and primary source access
• Can be useful if your firm also handles more law-heavy tax questions

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My practical recommendation

If you’re a mid-size CPA firm and want the safest “default” choice:

• Choose CCH IntelliConnect/AnswerConnect if your work is heavy on state tax, compliance, and practical guidance
• Choose Checkpoint if you want a very balanced, widely respected all-around tax research platform
• Choose Bloomberg Tax if your team does a lot of deep technical research and wants a strong expert-oriented platform

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What I’d look for before deciding

For complex federal/state research, make sure the platform has:

• all 50 states + DC coverage
• primary sources: statutes, regs, cases, rulings, guidance
• editorial analysis and treatises
• current awareness/news
• good search quality and citator tools
• integration with your tax software and document system
• training/support for staff

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Bottom line

If you want one answer: CCH AnswerConnect/IntelliConnect or Thomson Reuters Checkpoint are usually the best fit for a mid-size CPA firm.
If your priority is state tax depth and workflow, lean CCH. If you want a very strong general-purpose tax research platform, lean Checkpoint.

If you want, I can also give you:

1. a side-by-side comparison table of Checkpoint vs CCH vs Bloomberg Tax, or
2. a recommendation based on your firm’s exact profile (number of users, tax software, budget, and practice mix).