I ask because I've been thinking of trying Guix or Nix. I lean more towards nix due to popularity but also because theoretically a language tailored for package recipes may do better than guille.
Nix syntax is just... strange, and undiscoverable to me. Coming from a emacs/lisp background, Scheme was just easy to understand, and there was no ambiguity in contructing grammars out of thin air.