That's funny, I always thought Coke was sweeter. Anyway, I like to buy 2 litre bottles for when I'm on the computer, and I've noticed how fast Pepsi goes flat--much faster than Coke. That's good enough reason for me.
I second larry here... I always thought Coke was the sweeter one, it's the reason why I've always liked it better than Pepsi.
I vote coke. Though I tried out Pepsi zero during my internship and found out that that tasted pretty well (coke zero tastes goddamn nasty)
I prefer pepsi. But I wish they would make the diet version with a different sweetener than aspartame.