Coca-cola no doubt. I used to be able to knock back a few liters a day, but I am on a diet now, so I actually cant remember the last time I had a soda...At least a few months...
what's the difference between regular and mexican coke?
As people have mentioned, mexican coke uses cane sugar instead of high fructose corn syrup. Which not only tastes better, but I think has a phenomenally better texture as well.
Boylan's ginger ale is also probably the best one i've ever had, for the same reason as the mexican coke.