Fedora Silverblue
I use Fedora Silverblue, I don't know if that (still) counts as "underground"-distro.
Reason I switched: I've been distrohopping/ desktophopping for the whole time I used Linux (~2-3 years) and always came back to Fedora.
I really like it's sane (for me) defaults.
Problem: I broke pretty much any system I installed after a few weeks.
Knowing enough to change everything, but doing exactly that without knowing exactly what I do and how to fix stuff is really bad.
Instead of fixing a problem, I just reinstalled. That took me just an hour everytime, but still is a bad practice, even when it's quicker.
Also, everytime I was happy with Gnome, KDE got a shiny new feature I just wanted to have, and I switched the Fedora spin, since switching DE on a used system feels really dirty and buggy.
The last time I broke my (Tumbleweed) install without actually doing anything I just said "Fuck it, even if I loose some freedom, I will now only use immutable systems from now on!".
I decided for Fedora, and oh boy...
Actually, I didn't loose much freedom or functionality at all!
(Only exception: no VPN app, I have to use the menu from Gnome; and somehow, Boxes doesn't work atm, maybe that's just a bug).
I'm now using it for 2 months and couldn't be happier!!! Why?
- Atomic updates + super quick and easy rollback support (already saved my butt) by rebooting and selecting another image.
- Clear separation between "my" stuff and the OS, which is really intuitive.
- Feels clean.
- I can rebase anytime I want (switch to KDE, a WM, and so on) with one command and no residual data or bugs.
- Self maintaining with automatic updates in the background.
- Unlimited software: not an advantage of SB, but you have to use distrobox sometimes, and I would never discovered that tool without!
- AND, a project called uBlue .
You can create or download custom images, like a SteamOS/ Nobara-clone, Vanilla with QOL-changes, almost all DEs (e.g. XFCE, which is unsupported by default), and so on.
I'm really in love with Silverblue, everybody should check it out!