If I'm traveling alone, SSR Studio all the way. Walking to DS from SSR is vastly overrated, however, unless you're in the preferred Congress Park section. Boats can be a PITA if you don't time them right. I always have a car, so unless I'm going to MK, I'll drive.
OKW is great for parties of two or more, their gargantuan rooms (even with two, we get a 1BR) can't be beat. Parking is really convenient right outside the units, and much appreciated; after a long park day, a long walk back to the room is the last thing I need.