I know it's not perfect, but it's pretty reliable for me (and full disclosure, I work for a different subsidiary of Cisco - but I also try to be pretty critical of it since I'm close to it)
I don't use Zoom a ton, but I've experienced what feels like a similar amount of sluggishness and AV issues as I have on Webex. At this point I know I'm a bit too close to have a useful anecdote, I'm just surprised that Webex is still put in the same group as Teams / Hangouts / GTM.
Again, not trying to sway you, just understand a bit better.