When comparing GuixSD vs Parabola GNU/Linux-libre, the Slant community recommends Parabola GNU/Linux-libre for most people. In the question“What is the best OS that is mainly under a GNU license?” Parabola GNU/Linux-libre is ranked 3rd while GuixSD is ranked 5th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Good for learning
For sure not the best one to be your main distro, but very good for learning as you can contribute to make this project to improve faster and then someday we will see the first stable release of this distro.
Pro Very modern concept distro
It has some interesting characteristics for the more technical users that could become a good contribution to the general GNU+Linux ecosystem.
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 All the benefits of Arch Linux, only 100% certified free software
Pro Very Secure
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
Cons
Con Loads to learn
New technologies demand new learning...
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 Not compatible with AUR
Unlike other Arch-based distros, this free distro doesn't support AUR.
Con Same cons that apply to Arch Linux
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 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 Not really free
People have to pay hundreds to maintain this distro.