NixOS. Gentoo gets into trouble when you need multiple versions of the same library at the same time. Also while the infrastructure supports it it's annoying that gentoo doesn't provide pre-built binaries, like yes some people might want to have reason to build their own bash but I think I'll be fine with a standard build. NixOS? If you install something usually it's going to be pre-built. Change a couple of configuration flags? May or may not be pre-built. You want to apply a custom patch? It's going to seamlessly build from source.