Is the bolded item from a survey? I don't like Coke products--and Diet Pepsi (with caffeine) is (IMHO) much better than any Coke product. Diet Dr. Pepper, otoh, is pretty good (it is in the Coke family, but is not branded COKE).
Actually, Dr. Pepper is independent, and seems to cut a different distribution deal in every location. I've seen them as independent distributions and as part of the local Coke, Pepsi or RC cola distributor.