When comparing Gentoo Linux vs Void Linux, the Slant community recommends Gentoo Linux for most people. In the question“What are the best Linux distributions for desktops?” Gentoo Linux is ranked 3rd while Void Linux is ranked 9th. The most important reason people chose Gentoo Linux is:
You build the package from a source you can see and read. You decide which features you want to build in and which aren't needed. You can choose build options, optimisation and whatever else fancy stuff you want modified. With a binary distribution this simply isn't possible.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Full control of the software
You build the package from a source you can see and read. You decide which features you want to build in and which aren't needed. You can choose build options, optimisation and whatever else fancy stuff you want modified. With a binary distribution this simply isn't possible.
Pro Portage's emerge is powerful
Portage is a package management system with a huge amount of options and features.
Pro Fully customizable
The usage of advanced features like USE flags makes it more customizable than any binary distribution.
Pro Freedom
You are free to do whatever you want with it. As a result, its configuration reflects your unique taste and personality.
Pro Great for anyone who is serious about learning the intricacies of Linux
It's useful for both beginners and professionals. For the installation, Gentoo offers various types, which are referred to as stages. Basically meaning how in depth you would want to go into the process of installation. For beginners it's useful to choose for a starting distro due to its various stages that can be very time consuming but beneficial as you learn the composition in general of Linux.
Pro Can by optimized to any given CPU by using proper compile flags
Since everything is being built on your PC you can fine-tune the code to make use of your CPU. And all it requires is two lines of string variables in a global config.
Pro Portability
There are many architectures available for Gentoo : i386, x86-64, PowerPC, PowerPC 64, sparc, DEC Alpha, ARM, MIPS, PA-RISC, S390, IA-64, sh, m68k.
Pro Can be officially systemd-free
Gentoo's default init system is OpenRC. Gentoo also officially supports systemd-free Gnome and udev. Users are free to choose any init system they want.
Pro Documentation and community are second to none
Provides a whole handbook to refer to during setup and usage.
Pro A very large collection of software is available
There are more than 19.000 packages available in the official repository. And even more with overlays.
Pro Gentoo does not impose a standard look-and-feel
Pro Superiority and smartness
You get superiority and get called smart daily for going through the processes of punishing yourself to a compile install you also get a cool neofetch logo.
Pro Live USB installation
Installation via a Live USB allows you to go back and fix mistakes from it without having to restart the whole installation process.
Pro Rolling release
A single instance of Void will be supported forever without needing to reinstall (you can update the system every day instead of having to install one major update every 6 months or so).
Pro Very minimal
More minimalistic than Arch since it doesn't use systemd.
Pro Runit init system
An init system with the "do one thing and do it right" mentality. Void Linux does not support systemd.
Pro Easy to use installer
Unlike it's closest competitor, Arch, Void includes a very user-friendly and simple installer in the ISO.
Pro Runit is fast and easy to configure
Runit init system is incredibly fast to boot and very simple to use.
Pro Different DE's live ISO's are available
Arch Linux doesn't make ISO's with different DE's. One need to manually install it through CLI version. But Void which is competitor of Arch, provides a wide range of DE's ISOs.
Pro Very lightweight
Base installation can idle at less than 250 megabytes of RAM.
Pro XBPS (X Binary Package System)
A brand new package manager that is fast, full-featured, and tailored specifically for Void Linux.
Pro BSD-like improvements with Linux
Full support for LibreSSL, an OpenSSL fork focused on maximizing security. The xbps-src package builder works in a similar manner to BSD's ports collection.
Pro Musl image available
Musl libc is lighter and faster than bloated glibc. Musl has been argued to be more secure overall than glibc also but is also not supported by all software.
Pro Friendly forum
Unlike the Arch Forum, it is a friendly forum (although small).
Pro Xbps-src
Xbps-src is a source packages collection which is pretty similar to FreeBSD's ports and may replace AUR for Void users.
Pro Many packages
There are some packages in official repos, than may be found only in AUR.
Pro Cool Neofetch logo
Neofetch looks good.
Pro No systemd
Uses runit instead of systemd.
Cons
Con Not beginner-friendly
You have to read a lot of instructions to start, even if you are familiar with Linux. Furthermore, as you have to configure the kernel and init system, expect some boot failures at beginning.
Con Since everything must be compiled it takes a lot longer to update
And if you have to update the kernel or some heavy software like Chromium it can takes hours if not more on weaker hardware.
Con No default installer
Installation must be done manually by following instructions in the handbook.

Con Customized package installation can take a long time and cause installation failures
The Gentoo package management system allows you to configure what compilation flags packages should support - i.e. specific processor flag support (SSE, SSE2, etc.), -O1, -O2, -O3 optimization, etc.
If you accept one of the default flags, Gentoo downloads binaries from the server. However, if you decide to optimise, it can and will download all source packages and start compiling allthe programs and libraries on your system. If your chosen flags don't work with a particular library, installation will fail.
Con Somewhat outdated solutions
While being outdated per se is virtually impossible for a rolling-release distro with a large community, a large portion of said community sticks to outdated solutions. For example, Gentoo's primary init system is OpenRC, which is cumbersome and awkward to use and provides little control over the system. While you can just choose systemd, it will require some tinkering. Other examples include stubbornly declaring an initramfs a last resort and an "oh my god 1337 H4XX0RZ surely have nothing better to do than trying for a month to exploit some vulnerability to steal my pony art, I have to fortify so hard my performance and ease of use will suffer" 90s security mentality.
Because of just how much freedom Gentoo provides you with, this usually isn't a big deal though.
Con Too hard
Con Not suitable for those new to Linux
Documentation is scarce, NTFS partitions aren't automatically mounted, etc.
Con Not popular
Void Linux is not a popular Linux distro. So, if you run into a problem then it's likely you won't find any fix except from the maintainers.
Con Manual unclear about base configuration
Manual does not explain how to fix GRUB and gives no partition hints to the available options.
Con Niche distro
Fewer developers, smaller community, fewer packages than other distros.
Con Nvidia CUDA cumbersome to setup
If your using a Nvidia card with programs that require CUDA for fast rendering (Blender), you can expect some trouble getting it to work as it's not included with the Nvidiadriver of the nonfree repo.
Con No packages
Void developers refuse to package brave.
