Beginning: Ubuntu.
Until today: Arch
Why? I found in Arch updated software that I was interested at that time, I liked the rolling distro, minimalism, AUR.
I'm happy with my TWM (DWM) and multiplexer (tmux).
I did install other distros in old hardware like Slitaz, Debían that needs 32 bit.
I'm interested right now in things like Alpine and Void, because small and functional in Termux or older hardware. And some distrobox (similar to proot-distro in Termux).
Now learning a little bit of Groff with markdown (pandoc) to create PDF, for a small and fast typesetting. I haven't found a way to convert markdown to pdf using MOM macros in Groff.