Coke definitely...

And I don't know why anyone would say they taste the same. Coke has that "bite" that Pepsi doesn't. Pepsi just tastes like a bunch of sugar.

Here's an interesting comparison... if you've ever had RC Cola, you might find that it tastes almost like you're drinking both Pepsi and Coke. It has coke's bite but still has that sugar flavor that Pepsi has as well. Sort of a love-hate relationship if you're that way about Coke and Pepsi.