Artix (Arch w/out systemd) supports many inits. I’d recommend dinit (which is very easy to use) or s6 (which seems more stable on Artix, but less user friendly helper tools). Both are very fast, faster than the other inits.

• There is also Chimera Linux which uses dinit and is very clean imho. A very modern take on making a traditional Linux distro which does things well and uses clean and simple OS software stack.
• Void Linux uses runit
• Devuan (Debian w/out systemd) you can use sysV, OpenRC, or runit
• And obviously there is Gentoo, which supports using OpenRC, with unofficial community guides for some other inits.