If said it a hundred times already. All of them could have killed each other multiple times. Naruto and sasuke both could have one shot the other. Plot restricts these though. At the end of the day its a story (fiction) theres no way to really know for sure what would happen without plot restrictions. Its the same as arguing over whos better between Michael jordan and kobe or LeBron. At the end of the day its all speculation because we will never be able to know the answer because they cant play against each other in their prime due too different timelines (restrictions) its cool to have an imagination but lets be mature enough to know this is still an anime and not real life