I'd go for beauty.
I don't understand the mentality of the people on this thread who think badassery is "more useful". For WHAT, pray tell? Getting into fights? How is that in any way a positive? And how many people really expect that they will NEED to save the world? I haven't exactly seen a "need of badass" crisis in a long, LONG time...
The OC's description of "beauty" includes charm and charisma; why be a tough guy when diplomacy can avoid / settle the situation before violence breaks out? Furthermore, beauty is also associated with grace and finesse. Take all the brawn you want; I'll just flip you down with judo, dice you with my rapier, or use my pinpoint accuracy to snipe you between the eyes before that minigun of yours can even wind up.