Comment Re:There's also pclinuxos (Score 1) 140
Modern systems are powerful enough nowadays that Gentoo's build times are not as painful as they used to be. So, rolling-release, systemd optional (mine run OpenRC), source-based (thus, configurable ad-nauseam). A little brittle when installing for the first time, and on the first few days of messing with it, but when you get the hang of it, I believe there is nothing else better (again, if you have reasonably modern hardware). A tinkerer's dream.
Arch Linux is also rolling release, and I believe systemd is optional (even though it is the default init system), but has nowhere near the customizability Gentoo has.