Jitsi is amazing. I tried out the desktop client version maybe 10 years ago and it sucked hard. More recently, using their webRTC version has been the smoothest

Jitsi is amazing. I tried out the desktop client version maybe 10 years ago and it sucked hard. More recently, using their webRTC version has been the smoothest voip experience I've ever had, and it's gratis, and it's open source, and I don't even need to register. It has high quality audio, video, and screen sharing. Honestly, I have no reason to use anything else.