Luffy surpasses Zoro as the strongest due to his physical strength and Gum-Gum Fruit powers. Zoro's hard work and training put him close to Luffy's level, aiming to surpass him by defeating Mihawk.

Given the current situation, it appears that the ones likely to lead fans into this upcoming combat are likely going to be Luffy and Zoro, two of the most important characters in One Piece ...