For me
Mint
Manjaro
Zorin
Garuda
Neon
incredible flexibility of Portage
Exactly.
I know people running systemd AND OpenRC on their Gentoo installs. Gentoo is a metadistro. It gives you the tools to build your own distro. SO in comparison to LFS, Gentoo is pretty similar. It’s just the tools that differ (although one can use Portage with LFS…)
Gentoo gives you a thorough course in Linux fundamentals
I basically learned everything Linux related from using Gentoo.
I can’t imagine why someone would want both init systems; that’s awesome.