I actually think that voice calls via Element are really solid. 1 on 1 calls can be done via P2P which is amazing for audio and video quality. Group calls are also pretty great with the upcoming (and already available) voice rooms. I really enjoy it and barely use Discord anymore since I got most contacts to switch.

I mean, let's be honest. Discord is actual garbage. Their clients are slow and usability on Linux is extremely limited. For example, streaming with audio is not possible on Linux for some really stupid reason. They use a very old version of Electron for everything. They are financed by China afaik. Push notifications on Android aren't reliable. It's just a hot mess. I'd take Element any day. Although, I will admit that Element has issues, too. The voice rooms are still in Beta, there are some quirks and steaming with screen audio doesn't work on Linux.