When chosing between the two I do choose Coke ..but I don't really go out of my way to have it much these days. I'm with the guys that go for orange Fanta. (whose stupid idea was it to have other flavours anyway? Fanta should be only ORANGE!) ..If I'm after something a bit less blatantly-sugar I'll go for Bunderberg Ginger Beer (yummy). L&P (Lemon & Paeroa) is probably my favourite carbonated drink, but when outside of New Zealand it's not really an option.
The only coke that is caffiene free is Diet-coke caffiene free. Coke zero is a different forumlua but it also has zero sugar and zero calories. Diet coke just has no sugar and is a different formula also.
This is my official pregame drink. PRO TIP: Never go to a house party without pregaming. Otherwise you're going to wait in line half the time your there, and your chances of getting drunk are far to low.