I've used Skype (for business and normal Skype), FaceTime etc. The Zoom experience is just much better for larger groups (> 10).
I use Teams at work and would say it is comparable to Zoom in terms of AV quality (Microsoft owns both Skype and Teams portfolios, but Teams is built on a modern codebase that runs on different, markedly superior infra than Skype). Unfortunately Teams only works in the enterprise (O365), and it is still fairly new so it doesn't have a lot of the collab functionality like whiteboarding and breakout rooms that Zoom has.
Privacy issues aside, Zoom really is a better product. People are more forgiving of a product's peccadillos when it just works.
I use Teams at work and would say it is comparable to Zoom in terms of AV quality (Microsoft owns both Skype and Teams portfolios, but Teams is built on a modern codebase that runs on different, markedly superior infra than Skype). Unfortunately Teams only works in the enterprise (O365), and it is still fairly new so it doesn't have a lot of the collab functionality like whiteboarding and breakout rooms that Zoom has.
Privacy issues aside, Zoom really is a better product. People are more forgiving of a product's peccadillos when it just works.