NixOS is the new Arch… (cat, meet pigeons) Unfortunately It doesn’t have as much basic training as Arch did (which archinstall obviates, not that I think this is a bad thing, it’s time is here), which did so much to improve community. Unfortunately NixOS’s doco is woeful, while ArchWiki is gold standard.
I say this as an ex Arch type who moved to Fedora, now ublue-kinoite, waiting for Nix to mature enough to daily (although I do have a T440p with 3 boot drives not doing much, hmm)…