I have the opposite experience, Teams shits the bed constantly, chat is invisible half of the time, audioproblems galore, random hangups. Meanwhile, zoom works perfectly every time
I had the exact opposite experience so bad, my job required me to install Windows after 5 or 6 years.
Essentially, Teams classrooms cannot be larger than 200 people. Since our classrooms were as big as 800 people, Teams have a system like conference. However, it specifically mentions that you cannot create and host a conference unless you are from Microsoft Desktop App.
I resigned a few months later and finally got rid of Windows, but it was a very bad experience for ne.
Thankfully I haven't used teams for a while, but my main issue with it was that it was trying to do everything poorly rather than one thing well. It's text chat, video chat, file storage, it had every MS Office product integrated. That meant you had to force your way past a bloated mess to get to the function you needed. The video chat was lacking the options that zoom had. It didn't have a proper speaker mode at that point, it used phone audio rather than speaker audio, there were less good options for screen sharing(whiteboards ect). It was always slow, memory hungry, buggy and unstable on Firefox/Linux. The desktop app was no better because it's literally just the web app in electron, but it had the added problem of being very difficult to fully close.
I feel you haven't used Teams in years because none of what you mentioned has been my experience starting using teams 2 years ago. (Only point is that I'm unsure about whiteboards, since I've never needed to use that)
I don't think it's fair to discredit everything I said with "you haven't used teams in 1.5 years".
Some of it is opinion " teams is bloated", some of it is a fact "teams is an electron webapp, which makes it slow and inefficient compared to a native app", some of it is very specific to my setup "teams is broken on my computer with my config of Firefox and Linux".
I've used teams on fast Windows computers with fast internet connections, and it was far less frustrating. Maybe that's why your experience was better.