I like coke more since its not as sweet as pepsi. But I'm not too picky. I've been conditioned to like cherry pepsi when I'm at a movie but that's just because the theatres i've been to have never carried cherry coke.
When I DO drink pop (soda) which isn't all that often, it's usually a Diet Coke. I only drink it for the caffeine, and because I don't want extra calories, diet is the only kind I'll drink. I LOVE caffeine. I couldn't exist with it. Black coffee is my life-saver.
i prefer water...but when i do drink soda, its usually a coke. Its really not that big of difference though, if they only have pepsi when i want a coke, i will take it.