I didn't know about home-manager, but it seems like it.

Scheme is a more mature and more expressive language than Nix imo. And you can write your home configs in scheme too.

The differences aren't that big, nix is great but I find (at least I did two years ago) the documentation a bit confusing. Both are great. I like scheme a lot better than Nix (the language), and the tooling is a bit less confusing to me.

Exactly. The concept is great, but my Guix system (Nix fork from GNU) is already reproducible and capable of rollbacks and transactional upgrades (and declarative system configuration !)

The learning curve is quite steep tho (the Nix leaning curve is even higher, at least it used to be IMO). If the sway spin of Atomic Fedora was available earlier I probably wouldn't have switched tbh. Both solutions are great.

Overall I'm quite happy with my Guix configuration. I've got roughly the same configuration on all my systems with ease, all config files (also sway for example) in the same language: Guile Scheme (LISP dialect), and the whole thing is in git. I don't imagine going back to a regular distribution anytime soon.

Kinda great! Although Guix and nixos are more my thing these days.