I grew up with a grandpa that referred to Pepsi as the "Nectar of the Gods". My mother drank Pepsi all of my informative years, so to me that was the drink to go to.
Now, move forward 30 years and a palate that is much more mature. I still enjoy Pepsi, and I really enjoy mexican coke more than coke (Really love the cane sugar over High fructose corn syrup). Both of these beverages are good IMO. but none will compare to the King of all sodas and beverages....
Dr. Pepper and DP10. There is no other soda that can compare. I have loved DP since I was very young and used to sneak it from my older sister (8 years my senior).
IMO, Coke and Pepsi are both good, I can drink them both with no issue. Now Mr. Pibb, that is just blasphemy.