If your goal is faster memorandum drafting and precedent lookup, the “most effective” workflow software is usually not a single tool, but a legal research + drafting stack. That said, the best all-around choice for most law firms is:

Best overall: Westlaw Precision + Drafting tools (and Edge if available)

Why it’s strong:

• Excellent case law search with citators and headnotes
• Fast precedent discovery through Key Numbers, topic filters, and related cases
• Drafting support via notes, folders, and document integration
• Strong secondary sources for issue framing and memo structure

Close competitor: Lexis+ AI

Best if you want:

• Faster natural-language research
• AI-assisted issue spotting and summary generation
• Good document retrieval and drafting support
• Strong integration with practice materials

Best for heavy memo drafting / document workflow: vLex Vincent + Fastcase/CaseText-like AI workflow

Good for:

• Broad research across jurisdictions
• AI-assisted synthesis and precedent finding
• Efficient document review and export
• Often more cost-effective than premium incumbents

Best for litigation teams focused on document-first workflows

Consider:

• Bloomberg Law for docketing + litigation analytics + research
• Relativity / Everlaw for large-scale document review, though these are not primary memo-research tools

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Practical recommendation by use case

If you’re in a large firm and want the fastest precedent lookup:

Westlaw Precision

• Best search precision and citator reliability
• Strongest for building memo authorities quickly

If you want AI-first legal research:

Lexis+ AI

• Better for asking plain-English questions and getting a first-pass outline

If budget matters and you want good speed:

vLex

• Strong value, especially if your work spans multiple jurisdictions

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Best workflow setup for faster memorandum drafting

For speed, use this process:

1. AI-assisted issue framing

   • Use Lexis+ AI or a general LLM with firm-approved safeguards to generate:
     • issue list
     • rule buckets
     • search terms

2. Primary authority search

   • Use Westlaw or Lexis for cases, statutes, regulations

3. Precedent clustering

   • Save the best cases into folders by:
     • rule statement
     • factual similarity
     • jurisdiction

4. Draft from a template

   • Use a memo template in Word/CoCounsel/other drafting assist tool
   • Insert authority and quotations directly from research platform

5. Citation check

   • Run citator validation before finalizing

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If you want one answer

• Best overall: Westlaw Precision
• Best AI-assisted research: Lexis+ AI
• Best value: vLex

If you want, I can also give you:

1. a ranked comparison table of the top platforms,
2. a solo practitioner / small firm recommendation, or
3. a step-by-step memo research workflow optimized for speed.