Gentoo by default prefers OpenRC over systemd, though you can chose which one you want while installing.
The whole systemd vs sysv back and forth is a smokescreen, because while sysv stops at init systemd continues on to cron, networking, sessions, dhcp, dns, /dev, and soon to be ttys etc.
And while the kernel is maintained under the rule that change do not break user space, systemd developers seem to do changes with a permanent "deal with it" meme.