When comparing NixOS vs Bliss OS, the Slant community recommends NixOS for most people. In the question“What are the best Linux distributions for desktops?” NixOS is ranked 19th while Bliss OS is ranked 50th. 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 Extra launchers
Comes with a taskbar launcher and the Pixel launcher.
Pro Rooted with a few clicks
Similarly to android-x86, it's rooted with just a few clicks, thus allowing the use of AdAway and other Ad Blockers.
Pro ARM Virtualization
Like android-x86, it comes with ARM virtualization support, so you can run many Android ARM apps on your x-86 device.
Pro Google Play Store
Google Play Store is installed by default.
Pro Android Apps
There exist an app for any task.
Pro Simple Linux distro
Like ChromiumOS it has a very simple(stipped down) user interface that is easy to understand and use.
Pro Unique
It is unique compared to taditional GNU-based Linux distributions.
Pro Multi-platform
Android is available for PCs, Phones, Tablets, TVs and even Clocks.
Pro Familiar UI/Design
Everyone who owns an android device already know the OS.
Pro Fully opensource
It is fully opensource and there is no company behind it.
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 Limited hardware support
Like android-x86, it has limited hardware support.
Con Not for power users
Android is designed for everyone so it might be a bit limited for power users.