Tried all. Only Meet and Duo are really good and even with video when you connect to somebody in a jungle, 50% around the globe far, on a 3G and 100kbps max and super flacky internet connection. All other failed under this circumstances (the predecessor hangouts is also okayish).

Don't know what Google does differently but boy this thing still works with really shitty slow internet. Glad to see AV1 usage here now. HD video chat with an analogue modem connection ;)