Currently I am using Cinnamon with Debian and quite like it. Previouly I enjoyed XFCE, espacially on slower laptops. Never really liked GNOME or KDE Plasma though. GNOME has too many animations and feels slow. At the same time its not very customizable. KDE on the other hand feels slow as well and though it is kind of fancy it seems not to be my taste and I did not like the way you customize either. That is not so important to me anymore. So please don’t read from this that Cinnamon or XFCE would be great for customization. I would not know it.
I have to agree. The way I could move fullscreen applications to other displays in GNOME was great