I’m currently using Debian Unstable. I used Fedora for a long time, but it got noticeably worse when IBM bought Red Hat. I also like Arch, btw. I have tried a bunch of other distros too, but they all have some quirk that annoys me (*buntu has Snap, Pop!_OS and Mint don’t support KDE officially, OpenSUSE is based around YaST, Elementary is weird about software installation, Manjaro fails at basic security 101 and keeps DDoSing the AUR due to bugs, etc.)
I have not tried NixOS yet, but I keep seeing it recommended, so I’ll have to try it.