Its not an argument or what but we can almost all agree that zoro is stronger than sanji even with the raid suit. However, sanji who doesn't use his hand on a fight and giving his time more in cooking is even more amazing that sanji can go on par with zoro. If sanji is given a time to use the sword instead, I can see the possibility of sanji surpassing zoro. Zoro is the epitome of hardwork, while sanji is a plain genius with a dirty mind.

But in the end, I don't agree of sanji using sword because his position in the strawhat is a cook. And a cook should always take care of their hands