When comparing Slackware vs Endeavour OS, the Slant community recommends Slackware for most people. In the question“What are the best Linux distributions for desktops?” Slackware is ranked 5th while Endeavour OS is ranked 21st. The most important reason people chose Slackware is:
Uses stable, plain-vanilla packages from upstream.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Stable
Uses stable, plain-vanilla packages from upstream.
Pro Strong adherence to UNIX Principals
Pro Ideal to learn more of Linux
Follows the original Linux roots. It still sees Linux as a free clone of UNIX so the distribution tries to be UNIX-like.

Pro Package management
Uses standard tar archives with shell scripting as packages.
Pro One more distro which is init based
Some users don't like to install systemd based distros because they increase booting and processing speed.
Pro Oldest surviving Linux distro
Besides Debian (which was first released in August 1993), it is the oldest still maintained Linux Distribution and was first released in July 1993.
Pro Super fast
Pro No systemd
Pro Good overall system quality and performance
Lean, fast and surprisingly stable.
Pro Great hardware support
Pro No restrictive handholding, pure control over everything
The user can do whatever he wishes because the distro IS Arch - with and easy installer and great themes.
Pro Fast and simple package management
There can only be one Package Manager (pacman) ;)
Pro Easy installer
Pro Great for low performance hardware
Easy on the specs and still blazingly fast.
Pro Lightweight
Pro Arch Linux Wiki
Being an "easy to install version of Arch" means it is exactly easy to use the famous Arch Wiki!
Pro As slim as you want it
Based on Arch, Endevour OS keeps its core repositories slim and free of unnecessary dependencies. The distro comes with no bloatware, only the necessary packages. The repositories are nearly as full as those of Ubuntu, while they are often more up to date.
Pro AUR support
One of the best reasons to use an Arch based distro.
You can find almost every package there is in the Linux world!
Pro Stripped down to the bone
Since its stripped down, it is fast and you don't have to deal with bloatware.
Pro Great XFCE implementation
Their use of themes and configuration look great!
Pro Not based on Ubuntu
Pro Cutting edge rolling release
Exactly as Arch - allows users to stay on the most up-to-date versions of the software they are using.
Pro Support for a large variety of new hardware
Rolling release means newer, up to date, mesa and kernel versions able to handle newer hardware with better performance!
Pro Helpful community
Great team of developers and excellent forum support on their official website.
Pro Great community
Cons
Con Not user-friendly
It is made to be KISS (keep it simple, stupid), so you have to do everything by hand.
Con Large size live ISO
One needs to vain 3GB+ data for downloading one slackware ISO.
Con Narrow repos
Doesn't offer the same amount of options as other distros do.
Con Niche/small community
Slackware is its own niche and has a small community.
Con Very slow release cycle
Hasn't updated in 3+ years.
Con Dependency issues
When it comes to dependencies, Slackware shows more issues than many other distros.
Con NET installer on the way
Con Not for everyone
Con Kalu needs a little refinement
I applaud the developers to carry on the legacy of Antergos, the only niggling thing that I would appreciate is, while it's nice to see news about updates; my opinion is that once you dismiss the notifications they STAY dismissed. And just clicking on the icon brings kalu brings it to the foreground. Or have the functionality of turning off the news altogether would be well received. Good distro.
Con Same Cons that apply for Arch Linux
Since it is based on Arch, it is harder to install and can easily break.
Con Uses systemd
