I’m looking for something simple that just works, with few crashes, few bugs and good community support. I’m moving away from Manjaro Cinnamon unstable branch to Ubuntu 20.04 and want a stable desktop environment. I only want bleeding edge software, but I want a stable foundation.
I’d probably say XFCE. Ultimately, all desktops are pretty stable, except when it comes to Wayland support. You are very unlikely to have issues with any DE on X11, (except the fact that any X11 issues on GNOME and Plasma might have been overlooked) but if you’re talking about Wayland, then GNOME will be your safest bet.