When comparing NixOS vs Funtoo, the Slant community recommends NixOS for most people. In the question“What are the best Linux distributions for desktops?” NixOS is ranked 19th while Funtoo is ranked 32nd. 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 Like Gentoo but more streamlined
The profile system improves portage's usability without losing the soul of Gentoo.
Pro Use flags that are suitable for a task or environment are grouped into Profiles
It allows selecting, for example, gnome or desktop profile with most of the sane use flags enabled inside the profile.
Pro Portage tree split into kits
This allows more fine-grained control over package updates, and packages can be now tied together inside the kit to minimize dependency breakage while upgrading.
Pro `boot-update` to take care of bootloader configuration
A tool to update your grub config.
Pro Funtoo Linux offers a variety of stage3 builds
Customized to a variety of CPU microarchitecture variants from AMD, ARM, and Intel.
Pro Stage3 sources are built using the Funtoo Linux tool 'metro'
It's a sophisticated replacement for Gentoo's build tool 'catalyst'.
Pro Uses GIt instead of Rsync
THis makes updates so much faster!
Pro Stage3 archive coming with pre-compiled kernel based on Debian's kernel
Pro Simpler template-based network configuration
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.