I'm running Pop!_OS. I tried Mint and EndeavorOS. I found that I don't like vanilla gnome, and while I appreciate KDE, it's too Windows-like. Which is contrary to what I'm trying to do by switching to Linux in the first place. So Pop is perfect for me.
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slackware
PopOS for me. I have played around with Linux in the past, but never seriously dived into it. The whole Windows 11 Recall fracas changed that. I went with Pop because it's an out-of-the-box distro. Everything just works, and it has Nvidia and AMD graphics support baked in. I used to not like Gnome, but it's kinda growing on me now. Then again, that's the beauty of this OS: Don't like the desktop environment? Download a new one from a bunch of alternatives. Current distro not floating your boat? Make some bootable USB drives of different distros and take them for a test run.
It's a beautiful thing.
Currently I run GNU Guix on my desktop, laptop, and servers. I like the dedication to software freedom and the way package management works. Before that I used Debian until 2019, Trisquel until 2014, and Ubuntu until around 2010. Debian and Trisquel are fine and I don't have anything against them, I just like the Guix package manager more. I've used Xfce with all of these (and before then, GNOME 2). I set it up the way I like it and it never changes.
I typically run LineageOS on my mobile devices, without microG or any proprietary apps. As I've said before my preferred OS would be some variant of GNU/Linux, preferably Guix as well, but LineageOS works well enough.
I run OpenWRT on my router, and had a previous router than ran LibreCMC (a variant of OpenWRT using Linux-libre).
Windows games are made for Windows so I prefer to use Windows for them. I don't particularly want to turn GNU/Linux into Windows, I think it deserves better than that.
Q4OS, it's Debian based with KDE, it's beginner friendly. It even has a Windows installer for easy dual boot