If your goal is to monitor your staff and gather metrics on their communication - Teams outdoes Slack and is incomparable. If your goal is to have a platform that enables your employees to communicate with as little friction as possible, I have yet to see anything capable of replacing Slack.

Teams especially, is something I loathe using every day. Everything about the UI and UX gets in the way of what I’m trying to do, rather than assisting in or even enabling it. It’s like it doesn’t want me to communicate - it wants me to react and offer as little useful information as possible.