When comparing NixOS vs Parabola GNU/Linux-libre, the Slant community recommends Parabola GNU/Linux-libre for most people. In the question“What are the best Linux distributions for desktops?” Parabola GNU/Linux-libre is ranked 6th while NixOS is ranked 27th.
Ranked in these QuestionsQuestion Ranking
Pro State of the art package manager
Atomic non-destructive upgrades / rollback of a system upgrade / declarative reproducible system configuration / unprivileged installation of packages / transparent source or binary deployment.
Packages don't break after a NixOS upgrade as they are prone to with other distros (especially Arch).
Pro Reproducible System
NixOS is configured using the Nix package manager, allowing your system to be replicated and kept in sync across multiple machines. Great for keeping a laptop and desktop in sync.
You can start with a minimal environment and add packages and software to suit your needs as you go along.
Pro Protects your freedom, certified free by the FSF
Pro Option to use OpenRC or Systemd
Parabola has an OpenRC edition and a Systemd edition, so users can choose which init system they want.
Pro Very Secure
Pro All the benefits of Arch Linux, only 100% certified free software
Pro Has its own repos
Parabola has its own repos (which are almost as large as Arch Linux) and the IceCat browser is included.
Pro Can be migrated from Arch Linux without a CD/USB
Pro Based on Arch Linux
Con Documentation is not good
Con A configuration change might end up bricking your system
Con Uses a text-based installer
Con Small repositories
Since Parabola is a completely free distro, there is no non-free software available and the community repositories are small compared to the AUR.
Con Won't work out-of-the-box on the most PC's
Almost all PCs need non-free drivers but Parabola has none to offer.
Con Incompetent developers
They only care about removing non-free software, rather than making a properly working OS.
Con Serves no purpose
It's just Arch without non-free software and is basically a niche OS with few users.
Con Same cons that apply to Arch Linux
Con Not compatible with AUR
Unlike other Arch-based distros, this free distro doesn't support AUR.
Con Not really free
People have to pay hundreds to maintain this distro.