The two main advantages of Guix are the language
I wouldn’t call that an advantage for the average person. Nix is far nicer to work with. Some Lispers might disagree, but I, for one, can’t exactly see the beauty in trying to turn Scheme into a configuration language with macros and hacks. Also Guix puts Scheme everywhere, things you can do with plain old Bash in Nix, you’ll have to all do in Scheme in Guix, so there is a much steeper learning curve.
You prefer:
over:
postInstall = '' rm $out/lib/basic-server $out/lib/helloworld $out/lib/postcollector ''
?