Gentoo setup involves completely different downloads depending on whether you want OpenRC or systemd. It's not like there's a single installer that you run which lets you choose between the two and has OpenRC as the default choice. They're both equivalent and the installation handbook doesn't suggest either one over the other.
Of course I have no doubt that there are more Gentoo users that use OpenRC than systemd, and I wouldn't be surprised if outing yourself as a systemd user will get you flamed in tech support channels :)
Of course I have no doubt that there are more Gentoo users that use OpenRC than systemd, and I wouldn't be surprised if outing yourself as a systemd user will get you flamed in tech support channels :)