Comment by p0w3n3d

I'd been working for 4 years with slack, and now for 5 months with teams. Slack was easier searchable, thread organisation is much better. In teams there are two types of communication - one is chat which has no threads (just answer to message as in WhatsApp), and channels which has forum vibe (more like post board).

Calls are better in teams, much better to be precise than slack. We rarely used slack for calls (it had nice feature of drawing on colleague's screen) which I think is also available in teams.

I think that integration is crippled in teams but I didn't have time to experiment with it.

So overall I'd suggest: go for teams if you want to call meetings and are not using slack as a main knowledge base, as we used to in my previous company. Especially considering matters highlighted in this article