“Coke Or Pepsi?” Is Now “Coke Or Diet Coke?”“Coke Or Pepsi?” Is Now “Coke Or Diet Coke?”For the first time ever, Diet Coke sales surpassed Pepsi sales in 2010. This makes Diet Coke the 2nd most popular soft drink in the country. Holding the number one spot is, you guessed it, Coke!Steven BohnerSteven Bohner