Pepsi's and Coke's ingredient lists back this up, as Pepsi has 41 grams of sugar per 12-ounce serving while Coke has a mere 39 grams. Pepsi is also slightly higher in calories, with 150 to Coke's 140. Therefore, if you're counting every single calorie and/or carb, Coke's going to be your marginally-better pick.