I've been using Jitsi and Google Hangouts for years, and in terms of reliability/quality, I can't really tell any difference. Haven't used Zoom much.

The nice thing about about Jitsi is it's the most simple process I've seen: just tell people to go to a simple vanity URL (URL you get to design) and that's all. I sometimes find Hangouts confusing with all the invitation, accepting, etc.

For people I videochat with often, I just say "jump on Jitsi?", then start typing in URL bar which autocompletes and boom, we're chatting

Bear in mind that your URL is your password, and you might occasionally get randos joining you if it's too simple a URL. Happened to me once at work, got some giggling people whilst we were pairing, they then hung up immediately :)

There is an option to add password to the meeting on the bottom right hand corner.

Used it several times, it's reliable.

It's reliable, especially for one-on-ones or smaller groups with particpants that have good bandwidth internet connections. In terms of bandwidth needs it can't compete with Zoom yet. If you have bigger meetings with participants from all over the world, and would like to use video, I wouldn't recommend it at the moment.