In terms of output? Korea, for sure. Their ability applies to all specialists (though I would like to know if it applies to writers and musicians, since Statue of Liberty doesn't give them production), so you don't even have to focus on scientists to get their bonus. In terms of fastest SV, though, I'd say that Korea and Babylon are tied, since the additional 2-3 GSes means that you have an excellent bulbing endgame. The GS at Writing is awesome, too, letting you blow through early techs like no tomorrow.