Particularly KDE. They have had some ups and downs but finally they have built a great foundation with Plasma and Plasma dark mode with Breeze is such a great balance of flexibility and fairly consistent look and feel. I stuck around with Gnome for too long in the name of simplicity but once you appreciate that Plasma gets out of your way once things are exactly how you want it, I have come to appreciate not having to install extensions for everyday "normal" things a lot more.
Plasma has been a bit buggy since v6 :(
they tried to do something with remembering "how you left things" between sessions, and even when disabled things are still weird...
Also some power management related hooks are not working as well as before. Like if you put the computer to sleep at night, and wake it up in the morning, the automatic dark-to-light theme switch doesn't trigger. at least not always.
Still the best system to work with though!