How does Slackware compare to ArchLinux? They both seem to be very barebones and force you to learn more about Linux, but ArchLinux seems much more popular from what I gather.
The Arch docs are superior (best that I've encountered in the Linux world) but Slackware is worth it to me to stay away from systemd.
Debian has documentation of similar quality, with the Debian Reference[2] and the Debian Administrator's Handbook[3], which is more up-to-date. Also in DocBook, and all I said about the Fedora documentation applies as well.
This will not be a popular opinion, but I don't think Arch Linux's documentation compares to Debian's and Fedora's.
[1]: https://docs.fedoraproject.org/en-US/Fedora/23/html/System_A... [2]: https://www.debian.org/doc/manuals/debian-reference/ [3]: https://www.debian.org/doc/manuals/debian-handbook/