As a little kid, I'd always choose flight, because, Hell, it's flight. Like, you could just fly around the world like Superman, or, because I'm old so very old, like Mighty Mouse. Or, and I'm not a hundred percent sure on this, Captain Caveman. Regardless, you were flying, and that was all that mattered. You saw yourself zooming over your neighborhood like the opening shot to every kids' movie ever, and you'd think there's nothing better, that would be amazing.
But when young boys become young men, things change, and instead of the super-hero ability of flying, you choose invisibility, because, well, boobs. I'm pretty sure that was all I was thinking about, and quite frankly, I'm kind of pissed that I had to consider this hypothetical, when that's less time for pondering, the aforementioned chesticles. Because in your teenage boy mind, there's nothing better, and they would be amazing.The Invisible Man.