Giorno and diavolo have different prospectives of fate, Giorno hated the mafia for affecting the lives( fate ) of others through the selling of drugs, while Diavolo sees it as a way to control/manipulate people, showcasing that the concept of fate to diavolo is something that can be controlled and manipulate by the strong. Diavolo sees him self as above fate shown by his stand and actions being able to escape the concept of fate it self, while Giorno sees fate as something that is unavoidable, but something that should be accepted this is shown through GER, their battle is a battle of ideals Diavolo belief of fate is something that can be changed, while Giornos belief is fate is something that is absolute, Giorno wins the fight because no one is above fate, fate is unavoidable it's something you have to accept whether you like it or not and if you try escaping your fate it will lead to a greater misfortune which is shown through the Infinte death loop. Golden experience requiem is the embodiment of fatalism.