Yeah, it’s a libre distro by default, but there is a “nonguix” repo that has proprietary software, including regular linux kernels. Depending on your hardware you would probably also need a custom iso with the regular kernel already on it. Nonguix and also systemcrafters have custom iso images that you can use for that. Nix does have a much larger repo, but software availability on guix ain’t bad. Guix also has a home manager equivalent, but they don’t have that many modules for it yet. There isn’t a flakes equivalent, but you can lock your channels to a specific commit very easily. The biggest difference is probably the scheme language, but what made me interested in it is the fact that it also uses GNU Shepherd as its init system, so there’s no systemd. You can also still use the nix package manager and home manager on guix if you’d like.