The Platform Tax Question
The Slack vs Teams decision often comes down to a simple financial question: does your organisation already pay for Microsoft 365? If yes, Teams is effectively free — and Slack becomes a $7.25-12.50/user/month premium for a better chat experience. If not, Slack is the better standalone communication platform.
AI Feature Comparison
Slack AI (available on all paid plans) provides conversation summaries, thread recaps, and intelligent search. Microsoft Teams Copilot offers meeting summaries, action item extraction, and content generation — but requires a separate $30/user/month Copilot licence. For AI value-per-dollar, Slack currently wins.
Final Verdict
Slack is the better product. Teams is the better deal for M365 shops. The choice is ultimately about ecosystem alignment and budget, not product quality. Both platforms are capable and well-supported — pick the one that fits your existing tool stack.