Guix :) It's a shame its package coverage is nowhere near NixPkgs, because it's so much nicer to read and write. I guess eventually we'll have "Compile-to-Nix" languages, seemingly these sort of languages tend to crop up after a while for languages with lets say "harder UX".
Maybe it would be a good idea to translate Nix packages to Guix automatically via LLMs. Then we could close the gap in available software relatively quickly.