Well, they all have their own strengths. I guess my favorites would be, in no particular order:
- Arch - Elegant and minimalist, Arch is where you go if you want to learn how your system works. But what I love most about Arch is the wiki. About 75% of the time, I can solve any problem I run into on any distro by referencing that wiki.
- Debian - easy to use and with rock-solid stability. The website is terrible though.
- Fedora is the one I always come back to, though. It's got a great balance between cutting edge and stability, it's easy to use, I'm strangely attached to DNF, and it just sorta feels like home. The community is nice too.
I like some others; Nobara is great if you're a gamer, KDE Neon gives you an awesome and stable KDE environment, and Linux Mint is perfect for.beginners.