I use Arch. I haven’t tried Endeavour or Cachy as Arch just works for me. That’s not to say I had an easy time installing it as my first Linux distro after leaving Windows, but after reading through the wiki and installing it a couple times in my PC, I like how much control over my system it gives me.

I’d suggest looking into Kavita. I’ve been using it for a while now and it works great as a server to read and organize my epubs.