It's hard to compare them, because it's really 2 different things. I understand what parent means, and I think it's fair, but comparing Docker and Guix is weird

It's hard to compare them, because it's really 2 different things. I understand what parent means, and I think it's fair, but comparing Docker and Guix is weird, because they aren't really competing technologies. Docker is somewhat hacky solution for lightweight containers on Linux. It is something tagged by #virtualization, although it isn't really that. And, well, it comes with even more hacky solution to configure these containers. Nix/Guix is a package manager for your Linux distro. It is solution for stuff, for which you use apt-get. More generally, it is "the right one" solution for system configuration, which makes configuration reproducible. So it's hard to say, what is the difference between Docker and Nix/Guix because they serve different purposes, but if you compare configuration language, "the approach" - you don't have to think twice to decide which is better. Nix isn't hacky and Guix is even less so, as opposed to Docker.