I have to use both heavily at work right now, one part of the company is on Slack, another on Teams, I'm involved with both. Despite its (many) issues, Slack is

I have to use both heavily at work right now, one part of the company is on Slack, another on Teams, I'm involved with both. Despite its (many) issues, Slack is just so, so much nicer than Teams, the difference has an actual, substantial impact on communication. Teams feels like a disconnected and disorientating mess of ideas copied from other communication solutions in a huge hurry without understanding them fully and without even getting them to a point where they "click" and work as intended, and without thinking about how they fit into the big picture. Sole exception: Video calls are much better, when they work. The rest is a mess and makes communication a much more tedious effort than it has to be.