Being the most intelligent person is world is akin to having the most common sense in the world. It's kinda relative, but on opposite sides of the spectrum. Like cinna said, being the most intelligent person in the room can be annoying, I can't imagine that 100 percent of the time. I'd fool around and go all Dr Manhattan.
Just because your the most intelligent person doesn't mean your the smartest person tho, nor will you make smart decision, but you could have those intelligent convo's about the government, science, religion, math space and time etc etc.. And your ability to learn would be limitless, I'd probably go crazy. Not only that you'd be restricted to what you could and couldn't do anyway with the government money and resources.
I was going to say I'd take the most intelligent, but nah I'd lose myself. I'll take attractive, and keep the traits I have now.