Neither. Carbonated drinks are bad for health, they interfer with normal digestion and create chemical imbalances in the body.
I would any day prefer drinking fresh fruit juice, tender coconut or buttermilk.
i have always liked pepsi more than coke until some friend told me that the best thing to wash your w.c with is to pour a litre of pepsi in it and see how clean it becomes.i never tried it but stopped drinking it:)