I’m a opensuse tumbleweed user on my desktop and laptop. I also have an ubuntu home server.
I really like tumbleweed, but I have been thinking of switching to an immutable distro like guix or nix. I’ve tried guix several times and found it pretty good, but never stick with it due to its lack of KDE plasma support. Maybe I should give nix a try.
I actually have really fond memories of Sabayon, the community was really nice. It also served as a good gateway into Gentoo by giving you a pre-configured usable system, including its binary package manager, but also gentoo’s emerge (not that you should use both at the same time).