I say this as a long-term guix user.
I say this as a long-term guix user.
Curious, what is your need / use case? I typically just stick to the package manager for whatever OS I install, if I don't like theirs, I find a new OS.
(1) Making things reproducible. That is one of the main reasons. And not only installed system packages. You can also use it to build reproducible projects you develop, if the dependencies are available on Guix.
(2) The other one is installing software, that your distribution doesn't have in standard repos.
It helps a lot on Chromebooks, where it's not straightforward to get a recent release.
It also helps to get up-to-date packages if you're a regular user and your admin doesn't have them for some reason (maybe RHEL or Ubuntu LTS.)
Or even just if your admin doesn't have the packages installed.
There was a solid piece on here a few weeks ago comparing the two, written by someone with in-depth knowledge of Nix: https://news.ycombinator.com/item?id=44569032