Who could be better?
Who could be better?
The answer to this is the same as to all the other "Is _____ the greatest _____" threads on this forum: "No." I'm not even discounting the possibility that someone may phrase a thread in this manner to which one could answer "yes," but like your 437 predecessors, you haven't even named someone/something "good," let alone "great" or "greatest."
My Great Great Great Great Grandmother was the greatest vocalist of all time - FACT!