Whats better Pepsi, Coke or Faygo?

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Now everyday, i drink at least a liter of either diet coke, pepsi or Faygo cola. Now im partial to Faygo as once its flat, it still tastes as good as when its fizzy. But i also enjoy the taste of Coke and Pepsi, my question is what is your favorite one and why? If you like another flavor of cola other than Pepsi, coke or Faygo, lets here it, theres nothing better than learning of a new, possibly better flavor.