Not to mention ...
... Slackware's systemd free. And, for me at least, 14.2 has been completely trouble-free since I first upgraded from 14.1. I installed it, and it got out of my way and let me use the computer. Can't ask for much more than that in an OS.
Don't let that 30 June 2016 date scare you. 14.2 is actually up to date and modern, see for yourself at http://www.slackware.com/changelog/stable.php?cpu=x86_64 ... If you think you need a more modern kernel (you probably don't), try slack-current instead of -stable.
Before anybody says it, if you insist that you have to boot into a GUI, edit the (mostly) self-documenting /etc/inittab to reflect your preference.
Biting the hand that feeds IT
