I've never thought to try this, granted I rarely ever drink soda.

It's interesting to see multiple folks saying that Coca-cola and Pepsi taste the same. In my part of the world, there is (or was) a noticeable difference between the 2. I could easily discern the difference between them even in a blind taste test. "Coke" is noticeably more bitter and has more complex flavor. Pepsi is sweeter with sweeter flavor tones.