KDE Plasma on all my computers and also as desktop mode on Steam Deck. because it supports the latest technologies especially when it comes to graphics (HDR, VRR) also has best support for Wayland and multi-monitors. It looks great out of the box and it has a lot of features out of the box and I do not need to battle with adding some extensions that break with almost every update. KDE Plasma is also the most flexible desktop and I can set the workflow really to fit my desires and I can actually set many options and settings. And despite all these built-in features and configurability it still uses very few system resources and is very fast and smooth. Oh and the KDE community is one of the most welcoming I have met in FOSS world, and they listen to their users instead of the our way or the high way mentality I have so often encountered in GNOME for example. So yeah TLDR KDE Plasma is the one I like the most of all in the industry, even when compared to proprietary closed alternatives.