This¹ website says a Fuji apple, my favourite, my dogs also love them too, contains 16.6g of carbs of which 12.7g are simple sugars, whereas Coca Cola contains 10.6g of sugar per 100ml.
Amazing!
Rather than quote nutrition difference between the two I'll just give a subjective opinion: when I eat an apple I just generally feel ok, nothing different really. Coca Cola makes me feel ill, it upsets my digestive system and makes my nerves feel a bit jangle.
