It's actually quite a tricky question. I know the "correct" answer is to say intelligence, but I don't know.
Would I have Brad Pitt's looks but my current level of intelligence? I'm a reasonably intelligent guy, so if I can have Brad's face but keep my current intelligence then you have yourself a deal, but if I have to dumb down to stupid then obviously I'm not that keen. Do Brad's looks and intelligence come as a package? I'm not sure of his IQ, but he seems far from dumb, so I could
probably live with his looks/smarts combo if I had to.
Now to the other proposition. Naturally I'm not going to turn down Professor Hawking's intelligence, but I'd want to keep my face. No offence to Stephen, but...well, you know what I'm saying. I really don't want to be whizzing around in motorised wheelchair, even if I can explain black holes and quantum physics
really well.
Weighing everything up, I think I'll take my intelligence and Brad's looks. I'm plenty smart enough to get by in life, but a little extra prettiness never hurts.