nix vs native package manager on other distros.

i use arch (btw), and i hate how much i depend on the AUR, its very unstable. I switched to flatpak for my gui programs since the cli experience sucks. nix on the other hand works like a native package manager, and thats great for me. but i see that nix also includes stuff like coreutils (because of nixos im guessing). do i install everything with nix? if not what packages do i install with pacman and which with nix?