Long-term drinking of pop/soft drinks/Coke/Pepsi can do untold damage to your health. Phosphoric acid can cause erosion of teeth and bones (cavities and osteoporosis). Other ingredients include carcinogens derived when you digest the artificial sweetener and neurotoxin, aspartame, and the preservative potassium benzoate. High Fructose Corn Syrup messes with your insulin and can cause you to gain weight exponentially.
I firmly believe that the rash of juvenile diabetes we're seeing is a direct result of all those 8 oz cups of Coke that kids guzzle down with their "Happy Meals".
So, yes, of course there is an advantage to drinking water, preferably filtered.