What is Slack vs Microsoft Teams: which should a company use?

Slack is preferred by tech-forward startups and companies that value integrations, bots, and developer experience. Microsoft Teams is better for companies already in the Microsoft 365 ecosystem — the Office integration, SharePoint, and Teams calling features make it hard to justify Slack if you're paying for Microsoft 365. Most growing tech companies default to Slack; most enterprise and Microsoft-centric organizations use Teams.