When comparing NixOS vs Garuda Linux, the Slant community recommends NixOS for most people. In the question“What are the best Linux distributions for desktops?” NixOS is ranked 19th while Garuda Linux is ranked 26th. 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 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).
Pro Super-fast
Uses vram, and a zen kernel.
Pro Themes
The dr460nized KDE theme is awesome.
Pro Easy entrance to Arch Linux
Filled to the brim with lots of quality-of-life changes and optimizations that are simple enough for long-time Windows, long-time Mac users, and Arch newbies to understand. Though, it also leads to bloat or not necessarily helpful extra software. If you're not into the "bloat" added in, try checking out the barebones version, you'll need to know a lot of things bout Arch to fully use barebones.
Pro Highly customized interface
You already have most of the customization done for you out of the box.
Pro Unused RAM is wasted RAM
It takes just a bit more RAM than Manjaro. Edit: This statement is only true if it helps the user and since this could be running on a low end machine this will not.
Cons
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
Con Needs a lot of RAM
Minimum is 4GB, for most Linux distributions it's 2GB or less.