Here are the best options depending on what you need for forms, PDFs, and eSignatures:

Best all-around

Adobe Acrobat Sign + Acrobat Pro

• Best if you want the most complete PDF workflow
• Strong for creating/editing PDFs, forms, and legally binding eSignatures
• Good enterprise integrations
• Downsides: can be expensive

Best for simple, fast eSignatures

DocuSign

• Very easy to use
• Excellent for sending, tracking, and signing documents
• Great integrations with CRM and business tools
• Downsides: weaker for advanced PDF editing and form building than Adobe

Best value for SMBs

Dropbox Sign (HelloSign)

• Cleaner and often cheaper than DocuSign
• Good for straightforward eSignature workflows
• Easy to set up
• Downsides: limited PDF/form tools compared with Adobe

Best for forms + workflow automation

Jotform

• Excellent for online forms, approvals, and collecting data
• Can generate PDFs from form submissions
• Built-in eSignatures
• Downsides: not a full PDF editor

Best if you need fillable PDFs + light signing

PDFfiller

• Good mix of PDF editing, forms, and signatures
• Useful for small teams
• Downsides: less polished than Adobe in some areas

Best open-source/self-hosted option

ONLYOFFICE + DocuSign/another eSign tool

• If you care about control, privacy, or self-hosting
• Good document editing, but eSign usually needs a separate service
• Downsides: more setup

Quick recommendation by use case

• Need the most complete solution: Adobe Acrobat Pro + Acrobat Sign
• Need mostly eSignatures: DocuSign
• Need online forms with automations: Jotform
• Need a budget-friendly PDF/signing tool: Dropbox Sign or PDFfiller

If you want, I can narrow this down to the best 3 options for your budget, team size, and whether you need HIPAA/GDPR/compliance.