When it was introduced Teams was pretty bad but these days it works just fine. I don't see that it being a decider really more than just historical preference.
We have Teams and Slack and I don’t ever see anyone push for a chat in teams. Most channels are a ghost town. To me, teams would be “fine” if it’s all we had, but when you see it next to Slack it’s a no-brainer for me. Teams UI is just baaaaad