It all depends on where you are in your life, smarts will do you better as you get older and become an adult where education & career = status, and looks will do you better in your teen years in high school where looks = status
I'm already both smart and beautiful (or so everyone says), so why would I have to choose? =O Joking, but like someone pointed out, it depends on where you're in life. I doubt it being beautiful will make that much of a difference when you're 60 yo, but being smart isn't everything even at work. These days you need a wide range of skills at work and presenting yourself well is one of them; being smart but ugly wouldn't really help you a lot unless you work in a lab or somewhere people can't see you.
Smart but ugly. Otherwise, what would I make of myself in life if I were just beautiful and dumb?
Smart and ugly. I've never been beautiful, but I'm proud of being relatively intelligent. Why? Looks fade. Also, looks are never the most important thing in any relationship. People only tolerate stupidity for so long.