Oh seriously?
I use both Slack and Teams day to day (we use Slack internally, client uses Teams, so we are on both as a result).
Slack we never have any issues with, and can find information from previous conversations easily.
Teams? Fuck teams. Fuck it and then fuck it some more. Its slow, clunky, constantly has issues, very hard to find information unless you still have the chat open somewhere, and chats are spread all over the place (chats, teams, channels...). Teams also requires you to have access to the workspaces OneDrive and SharePoint as well if you want to share files, so if you dont have access to those things then ... you are limited to text only.
Its video call system is sorely limited, and even doing things like zooming in to the presenters shared screen is clunky and shit.
Teams is the worst collaboration system I have ever used, so dont try making out that its better than Slack or Zoom. It is by far the worst of the three.