So I've had to move away from KDE because its compositor (KWin?) is terrible at preventing screen tear, either on the desktop (in Firefox etc) or in games such as OverWatch. XFCE's default compositor wasn't up to the job last night after I installed XFCE too.
I switch to Gnome (on Xorg) and both issues disappear instantly.
Which DE and/or compositor is best at dealing with this issue?
Using a Vega 56 GPU with the latest stable-release mesa and the current 5.4 rc kernel.