When comparing NixOS vs RebornOS, the Slant community recommends NixOS for most people. In the question“What are the best Linux distributions for desktops?” NixOS is ranked 19th while RebornOS is ranked 41st. 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
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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 Arch Customization without the hassle
You can choose from 15 different desktop environments. Choose from a list of software to install that lets you pick web browsers, Spotify, what kind of office suite, etc. Not as robust in terms of choosing what you install compared to Arch, but more than enough for newcomers and those just looking to get things done. Nice midweight OS.
Pro AUR enabled by default
The Arch Users Repository is already enabled. Really helps with finding some proprietary software.
Pro Very stable
Pro Great community!
Pro Runs Android apps
Reborn OS has a program that allows you to install and run Android apps on your desktop. Great for app developers or those who might be addicted to a certain app.
Pro Flatpak support
Having Flatpak support adds a nice graphical app store to the OS. You can find most software you might need in there.
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 AUR enabled by default
this is a security risk since AUR packages are maintained by users rather than a single company and anyone can insert malicious code into the AUR packages
Con Redundant
it is just Arch Linux with an easier installer and doesn't provide any functionality that neither Manjaro nor Arch doesn't already have.
Con Uses systemd
Con Can be a little buggy sometimes
Although not outright system crashes or freezes, but programs not working correctly after an update is quite common. Some desktop environments can be temperamental. Examples: running Deepin DE at first and the zoom for the display is 150%. You can fix this by going to settings and setting the desktop to 100%, but then something else might happen, e.g. you lose icons on the dock. Minor headaches and some are easily fixable. Certainly not a deal breaker.