I feel like I learned more about linux and my computer by installing arch (before we had the neat installer we have now). So for me, arch is a better learning tool. I do really like nix (havent used it myself, but Im a functional programmer and declarative configuration is my jam) but it’s definitely a better way of managing an installation than arch I imagine. My next distro if arch ever fails me will be an immutable distro, Nix is definitely top 3 for me that I reach for