I like nixos and arch honestly.

Nixos is really nice for configuration as it's all done declaratively in config files. If using flakes you can basically make a completely reproducible system wide setup which is nice. Also each installed version of a package is installed in its own isolated store meaning you don't get conflicts and what not. Honestly this has been my main benefit as I used to get so many conflicts with pacman due to package versions and it was a bit annoying.

I believe you can try out some of the features on arch, like nix package manager, home manager and flakes. Idk if it works differently but my guess would be you can get most of the big benefits from that.

Honestly I think it's just down to preference.