The BSDs (Free,Net,Open, and Dragonfly) are excellent if you’re looking for an open source *nix that isn’t Linux.
I am specifically working more with FreeBSD as I think the day is coming that Linux won't have the ease of configuration it does now.
Yes, I've been planning to move all my machines to BSD for a long while now. I've been procrastinating because I have a lot of machines and the scale of the task is a bit intimidating. The window for procrastination appears to be ending, though.
You could jump to Gentoo + OpenRC
Or have a look at all the distros that don't use SystemD!
My fear is that more and more Linux software will depend on SystemD facilities directly.