I've found Hangouts to be equal in call quality to Zoom, and it runs entirely in the web browser. The only down side is it consumes a LOT of power, so you need to stay plugged in while you use it.
Consuming a lot of power could be a show stopper for organisations where lots of staff are on older equipment? Zoom works flawlessly even on older hardware.
Also can't have too many attendees
You can have 200, and you can also live-stream large meetings. It is a bit weird that you have to split the stream, but it's worked great for us doing ~300 person all-hands meetings.