Of the Coca-Cola beverages that contain sugar: Cherry Coke, followed by normal Coke.
Those without sugar: None, they all taste fucking awful - although since I stopped having sugar in my coffee I can tolerate Diet Coke now.
Of the Pepsi beverages that contain sugar: do they even do anything other than normal Pepsi?
Those without sugar: Cherry Pepsi Max, followed by Pepsi Max - although I've only been able to tolerate these since the no sugar coffees.
Of other colas: Fentimans Cherry Cola, followed by Fentimans Curiosity Cola.
Overall, I'd say I enjoy Cherry Coke the most.