If you already pay for Microsoft 365, Teams can feel “free.” If you live in Google Workspace, Slack can feel inevitable. The real comparison is how your team communicates under stress: incidents, launches, support escalations.
Hidden issues we look for
- Search quality across messages and files once history grows.
- Guest access models when clients and agencies need limited visibility.
- Mobile realities for founders who approve things between meetings.
Verdict (starter)
Teams wins when your world is already files-in-SharePoint and meetings-in-Outlook. Slack wins when channels are your system of record and integrations matter more than bundled meetings.