Which platform has the best document templates?

It depends on what kind of “document templates” you mean, but in general:

• Microsoft Word / Microsoft 365 — best overall for professional document templates like resumes, reports, letters, proposals, invoices, and business docs. It has the largest and most mature template ecosystem.
• Google Docs — best for simple, collaborative templates that teams can edit easily in the browser.
• Canva — best for visually polished templates like one-pagers, brochures, presentations, and marketing docs.
• Notion — best for workflow and internal docs such as meeting notes, project docs, and SOPs.
• Adobe Express / InDesign — best for designed, brand-heavy documents if layout quality matters more than ease of use.

If you want one answer for most people: Microsoft Word has the best all-around document templates.

If you want, I can also recommend the best platform by use case — e.g. resumes, business reports, legal docs, marketing materials, or team docs.