Ubuntu (gnome):

Kubuntu (kde):

Budgie (for OSX fans):

Mate (lightweight for raspberry pi etc):

Studio (with all the audio/video/graphics/publishing multimedia production software - they will use KDE instead of XFCE after 20.04):

Xubuntu (Xfce):

Kylin (for those Windows UI fans who don't want to put up with the lack of productivity in Windows):
