That's just a reason not to believe in you, because that means you don't even have a comprehension skill high enough to know which one is really the strongest between those two characters even though it was already clear in Arlong Park that Sanji is stronger than Zoro, twice as clear in Enies Lobby that Sanji is a lot stronger than Zoro, and thrice as clear in Onigashima that Sanji is by far stronger than Zoro.
That's objectively false; Sanji is the vice captain, always leading and instructing the rest of the crew after Luffy.
Zoro is just the combatant, who can't open his mouth without saying some absurdity that is soon proved to be wrong. The third strongest crew member, who is also the dumbest crew member, has no business whatsoever being the vice-captain.
Zoro is what Lucky Roo is to Shanks: the combatant of the crew. And Sanji is what Benn Beckman is to Shanks: the first mate, who is also comparable to the captain in strength, though Sanji is even stronger than Luffy.
