[aulin]

No experience with slack but channels in teams are pretty terrible.

Notifications off by default so people create new channels with you as a member, write extremely important information inside them and you find out weeks later.

Each post is like an announcement so nobody uses them for the everyday trivial stuff you need a channel for. For casual technical discussion, asking for help. Whenever you post in a channel, assuming people enabled notifications and your post will be actually seen, everyone is compelled to answer as the UI screams for attention.

And don't get me started about it hiding part of a post by default so you answer thinking you read everything but you missed an essential part because post was 4 rows and 2 were hidden.