FOS: Stands for “Free Operating System” as an inclusive term. Includes GNU/Linux, NonGNU/Linux, *BSD that are meant to liberate ones computing.
I’ll start, I use Linux Mint on my laptop that I use for work daily. It uses the latest Xanmod linux kernel and flatpaks for apps with GNU Guix providing everything else.
Mostly Debian Stable with KDE + backported kernel, deb for most apps, flatpak for any not in repos or problematic with stable versions like Telegram.
Had a go with Tuxedo OS recently and liked it initially, but it was a bit buggy and still relatively new, so back to Debian I went. Tuxedo is sort of like Pop!_OS with the kernel and mesa, except it uses up to date KDE as the DE.