When comparing Hyperbola GNU/Linux-libre vs NixOS, the Slant community recommends NixOS for most people. In the question“What are the best Linux distros?” NixOS is ranked 18th while Hyperbola GNU/Linux-libre is ranked 38th. The most important reason people chose NixOS is:
Atomic non-destructive upgrades / rollback of a system upgrade / declarative reproducible system configuration / unprivileged installation of packages / transparent source or binary deployment.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Same as Parabola
There's merit in having both distros installed, because sometimes you must need newer software as Hyperbola goes on Debian way and Parabola goes on Arch way.
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.
Pro Minimal
You can start with a minimal environment and add packages and software to suit your needs as you go along.
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.
Pro Robust
Packages don't break after a NixOS upgrade as they are prone to with other distros (especially Arch).
Cons
Con Parabola but with rusty and outdated packages
Con "Init Freedom Campaign"
The self proclaimed "init freedom campaign" claims that it protects user freedom, but in reality it doesn't, and it's heavily misleading. The campaign's goal is to "free the users" by trying their utmost hardest to force their hatred of systemd down every developer's throats and removing the user's freedom to fully appreciate systemd for the amazing collection of programs it is. This campaign also seems to be linked to the anti-GNU movement, which actively tries to remove all the credit that Richard Stallman should've gotten for making the (arguably) best operating system, and directing that credit to Linus Torvalds for making a bloated and messy kernel that does way more than a kernel should do (systemd isn't just an init system, it's made to be more than just that, unlike Linux), and his devteam, especially Steve McConnell who shametags every single line of code that happens to hardly fall within one guideline of the GNU coding standards.
Con Documentation is not good
A lot of the documentation of various functions is buried on the source code, their respective manuals, or non-existent. The documentation, the conventions, and the scattered toolchain really made searching for stuff easily missable.
Con A configuration change might end up bricking your system
