My SO has to use a multitude of tools, because all her university teachers use different tools, because there was no standard up front.

She (and I have to agree sitting next to her) states that Zoom by far has the best usability and user experience. It is easy to use, features are quite detectable and stuff like virtual raised hands are great for teaching bigger groups.

So I would say it is the best tool out there currently.

Personally I prefer Google Meet - but that is because I use it daily for work and it became free only days ago.