They are my 2 favorite distros, as I think they fill in 2 obvious local maxima in the design space: i) an imperative system with binary packages that tracks ups

They are my 2 favorite distros, as I think they fill in 2 obvious local maxima in the design space: i) an imperative system with binary packages that tracks upstream as closely as possible (Arch) and ii) a functional/declarative distro (Nix).