A Senior Developer working mostly with PHP and JavaScript, with a bit of Python thrown in for good measure, all on Linux. My tooling is simple, it's GitLab and JetBrains where possible.
Ubuntu
Most people have, but this is the one I use daily. Mainly because the rest of my team know how to use it, and it keeps us standard. It's really easy to use and customise or, as some people put it, "it just works".
It can be slow and clunky with the default GUI though.
Debian
I actually prefer this one to Ubuntu, and used to run it on my servers. I moved from it to Ubuntu full time a couple of years ago after some issues with some software package I needed (can't remember which one), and when I had issues with my file server.
I would absolutely go back to it
CentOs
I used to support the CentOs servers at my old job. Never really liked it. Probably because I am so used to Ubuntu and the Debian foundation it has.
Fedora
Way back a long, long time ago. Found it to be too unstable. It might have still been in single-digit release numbers at the time, though.
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It can be slow and clunky with the default GUI though.
I would absolutely go back to it