I like best Gnome with modifications, not vanilla. A permanent dock as per "Dash2Dock Animated", and the "Hide Top Bar" extension, so when an app gets maximized, both the top bar and the dock get out of the way. Also, disabling tap-and-drag via dconf (I really don't understand why this is enabled by default on most Linux DEs, it's extremely bad for usability), and enabling the min/max/close buttons via Gnome Tweaks. Other tweaks I like is the Bibata Modern Ice mouse cursor, and the Faenza icon theme. The rest are ok by default for the most part. It's better than MacOS for me.

Second best gotta be Cinnamon, using the Cinnamenu menu extension, not the default menu. Overall, they've thought of almost everything building this DE and its settings. For those who want the best "Windows" could ever be, Cinnamon it is.

Third is XFce. It's overall good, but it has some things that trigger me: no user admin app, no ability to turn off tap-and-drag (it just doesn't turn off no matter what you try), and on Debian at least, the machine doesn't go to sleep without asking for password (requires a policy-kit manual change). Its biggest advantage is that it's lightweight and I use it as lot for old machines.

I find the rest under-par. I don't like KDE, and I have thought long and hard why I don't. It's not how KDE is structured or works. KDE in fact is fine as a DE! Very powerful. It's the Qt toolkit that bothers me. When an app loads, it kind of loads in chunks. It doesn't blast everything rendered in the screen to feel smooth and modern, it kind of renders it as it reads it. And this just bothers me in a UI more than anything. Another thing I dislike is the long right-click menu on the desktop (same for Cinnamon btw).

MATE is nice but it's just buggy. You setup your panels one way, you logout, you login back again, and the items have changed position. Fully reproducible for me under many different distros. Very, very annoying.

LXDE/LXQT, Budgie, etc, are not as developed as I liked them to be.