[b3n]

Guix even comes with a Nix service[0] which is easy to enable if you would like to also use Nix packages.

[0] https://guix.gnu.org/manual/en/html_node/Miscellaneous-Servi...

[pyrox]

Nix also has a Guix service itself[^1], if you want to do the same in reverse ;)

[^1]: https://search.nixos.org/options?query=services.guix

[pxc]

I love that this goes both ways. What other pair of Linux distros mutually offer first class support for using each other's package managers alongside their own??

It's a cute little testament to the fundamental strengths of the functional package management paradigm, as well as helping users on either side of the fence fill some gaps in a pinch and providing more/easier opportunities to compare notes and inspire improvements.