A friend and I both got really nice microphones but when in a discord call you can not tell the difference between them and an above average wireless headset microphone (these are usually much worse than their wired equivalent).

Recording the audio in windows you can easily tell the difference between them, but not over discord. Even tried upping the bitrate but it made no noticeable difference.

No, I have been hanging around in Discord for a while now and I've run quite often into issues with connection issues for specific servers (I guess some clusters going down) and them being OOO for a while.

Mumble on the other hand tends to be pretty reliable and comes back up in a few seconds anyway whenever it fails.