UWC or SAIS? Which would you choose and why?

UWC. They've been around for plenty of years, have ironed out their curriculum and has a high success rate, whereas SAIS only opened its doors in 2009. Although if you're looking fees-wise, I'm sure SAIS is muuuch cheaper than UWC and much easier to get into SAIS than UWC as well (there's a waiting list to get on the waiting list to get on the waiting list for UWC!).