Not that I'm trying to dissuade you, as I am on Gentoo and have been for about 1 year now, but if you're only interested in other init systems, did you consider trying Artix?

I'd still say go with Gentoo if you want fine grained control over nearly every aspect of your system, as compiler flags, eselect profiles, and just overall minimalism make it superior for tinkerers imho.

That said, if you just wanted to experience other init systems like openrc, then Artix might be a good option. Prior to jumping to Gentoo, I was on Artix Linux with runit init system for 6 years. It was good, but I wanted to know more about Gentoo. There were some definite tradeoffs from Artix with runit, but I appreciated the fine grained control I got with Gentoo's compiler flags, so I stayed on Gentoo.

The only advice I'd say when installing Gentoo is to choose your profile carefully during initial install and to choose your stage 3 tarball accordingly (just think about your ultimate use case). Also, if you need to use wifi, make sure to install wpa supplicant while chrooted into the live environment.

Anyways, hope this helps.