[the_duke]

I had read both of those before.

The first one primarily just says "we use Scheme instead of Nix lang".

There are some differences that emerge from that, but most of what is described is also common or possible with Nix.

The analogy of clang vs Julia does not fit for me.

Nothing I've seen has yet described any significant difference, but rather affirmed that both are very similar in most regards.

[medstrom]

It's not just Nix lang it replaces, we use Scheme in place of a hodgepodge of languages (shell script, Nix, C and others). Almost all equivalents to C-hardcoded parts of Nix is inspectable and modifiable in Guix. There's code reuse across the stack. Even the systemd substitute is opened up for inspection and modification. Nix glues a lot of black boxes; Guix is a single white box. Both approaches are practical for different reasons.