To be honest with you. I hate soda.
However, given the choice (both are fountain) I would choose Coke.
Why?
1. Stays fizzy longer. I hate fizz. But it tastes disgusting without fizz. (Do not replace any F's)
2. Does not taste like mindless sugar (Dr. Pepper is better than Coke because of this).
3. It's a classic. In my opinion, and I may be wrong but Pepsi to me just makes me think of a ripoff of another company.. not that that is bad its just they are too similar. Since Coke (I think) was first, that one takes the gold.
That is all.