I think you might like to try it. Maybe to get a taste for it try the nix package manager first. Right now I'm kind of struggling on whether or not NixOS is the one for me or Gnu Guix. Both are pretty awesome.
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Your reason of "wish to start fresh" doesn't sound compelling.
Arch is stable, and works great. Biggest draw for NixOS is packages. I don't think NixOS has anything to offer in packages that I can't get in Arch. I'll not advocate switching to an experimental distro with who knows what other headache, just because I can run Debian or rpm packages. Not for a daily driver.
Do it only if you are bored or something.