My favourite DE has got to be Cinnamon, as much as I like KDE and XFCE, I prefer the simplicity of cinnamon where as in KDE has a bit too much of everything in the customization scene and XFCE I find a little tricky to get tiling working right.
Cinnamon to me is perfect as I easily transferred from Win 10 to Mint and soon Manjaro Cinnamon Edition.
What is your favourite DE and why? Tiling WM DE’s can be counted as well seeing as they have nifty navigation features.
I like Sway, it obviously needs a bit of configuration to be useful, but that’s partly what I like about it, and using a distro like Guix (Nix configured with Lisp) makes it easy to have the same settings on multiple PCs. Otherwise I like GNOME; it’s well supported and has many good apps. Touch/touchpad support is really good as well.