[DoofusOfDeath]

I believe you about Zoom. Unfortunately that's the only kind of information I'm ever able to get on the topic: anecdotal.

I suspect the reality is that, amongst the best-performing services, which one works best depends on network QoS details, network topology, particular client hardware / OS, etc.

For example: some conferencing software seems to have a real problem with echo cancelation, so either (a) everyone needs mic/speaker hardware that sidesteps the issue, or (b) you accept that everyone will go insane.

Similarly, difference conferencing software has different solutions to people talking over each other accidentally due to latency. One product (Cisco's maybe?) has an icon for metaphorically raising one's hand to request a turn speaking.