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BBB (Big Blue Button, for those unfamiliar) seems to be the favorite of lots of institutions in Germany. I think a government agency recommended its use, that's why it's so widespread.
So do I. During lockdown a french hosting company set up bbb instances on their infrastructure, and the experience was really good (they even activated the "join with your phone" feature).
Zoom and Gmeet are usable (usually calls are stable and quality is ok) but closed-source shit, and I had a lot of stability issues on public jitsi instances (though I never self-hosted).
I've tried opentalk for the first time a few weeks ago (it's included in my email provider plan) and it worked fine.
I know during COVID I tried Jitsi Meet eith a friend and we had quality issues using the FSF server. Zoom was way better. Have not conferenced since then. Plus way more people have Zoom installed, tested, and know how to use it.
Also Zoom, people can dial in by phone. My wife conferences with a friend where that is required.
Would prefer a FOSS alternative. Sadly above is our experience which shows why Zoom is way more popular.