I feel the same way about Guix with nonguix channel enabled. NixOS is awesome but I prefer Guile to Nix's language and I enjoy the docs more. But definitely sister OSes.
There's nowhere near enough love for Guix. I don't understand it. It has far better foundations. I would never invest time into some "config language". Using a real programming language has huge benefits, and it's a good one (Scheme).