Arch Linux. The control of Gentoo without sitting around for five days while everything is rebuilt.
Back when I was compiling Linux on a 120MHz PA-7200 I would literally wait for days to compile KDE and a few other related packages, but with a modern CPU I now wait only a few minutes. I'm not sure that Gentoo has any real advantages over Arch but it's pleasant to use and it makes me feel good to tune my compiler flags and rebuild everything.