Comment by dmit

NixOS. Had prior Linux experience, so wasn't too worried about learning multiple new major paradigms in parallel. Also had been running a lil' NixOS server for half a year before that, so I could carry over most of my configuration.nix from there, and also the safe feeling of knowing that if I do mess up stuff, I could with very high probability just reboot to a previous generation and have everything back to working exactly the same as before.

Edit: the two configuration.nixen has since been merged in a single dotfiles repo, which also covers my Macbook via https://nix-darwin.org.