Our entire organization uses Zoom. I don't know what Zoom does differently from Google Hangouts but it's waaaaaay better. Zoom is lighting fast and very good at maintaining a stable connection. I'm a fan.
Since we have 5 offices around the world, we rely on Zoom everyday. Without it, we would have a tough time getting things done. Being able to screen-share and discuss materials with someone across the globe is a huge improvement to our collaboration.