To give an example, they prioritize audio over anything else. Which makes sense because if you can't understand what the person is saying, you can't have a meeting. So they automatically downgrade or upgrade your video to try to keep latency decent on audio. Meet just has a manual setting where you can up or downgrade video or audio.
For the most part my understanding is that zoom is better at quality because it does not use webrtc - but hangout meet does. This means webrtc needs a lot of the fixing, which is hard because it's a standard.
zoom sends proprietary stuff over web sockets instead. Which is also why they prefer you use their fat clients with native decoding
To give an example, they prioritize audio over anything else. Which makes sense because if you can't understand what the person is saying, you can't have a meeting. So they automatically downgrade or upgrade your video to try to keep latency decent on audio. Meet just has a manual setting where you can up or downgrade video or audio.