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Oda said in an SBS that Zoro would specialize in CoA (Busoshoku) Haki and that Sanji would specialize in CoO (Kenbunshoku) Haki. I think the reason for this has to do with their different types of training during the 2 year time-skip. If you think about it, it was only Zoro, Mihawk, and Perona on Kuraigana Island. Based on what we have seen from him throughout the series (presumably not willing to fight Shanks because Shanks only has one arm), Mihawk values honorable battles, so it is likely that he and Zoro trained one-on-one together in such a way where Zoro did not need to fear for his life or keep his guard up when they were not training. Since he is the current greatest swordsman in the world, Mihawk’s attacks are probably insanely powerful and more than likely infused with Armament Haki (unless he held back). Therefore, Zoro had no choice but to focus on his own Armament Haki growth in order to cope with Mihawk’s attacks, and to avoid his swords from breaking.
However, on Momoiro Island (Kamabbaka Kingdom), Sanji was being chased day and night for 2 years by Okamas. He had to constantly keep his guard up and avoid being ambushed by the seemingly endless droves of Okamas. It’s safe to say that these Okamas were nothing compared to Mihawk, so we saw Sanji’s physical growth in a different way as he became faster and developed moves like Blue Walk and Sky Walk. Sanji had to focus on his Observation Haki growth in order to sense the presence and intentions of an entire island that was his enemy. Now, I’m not trying to say that Sanji now has this ridiculous Observation Haki that can sense everything. I just mean he needed Observation Haki more than Armament Haki in his situation. Same as Zoro needing Armament Haki more than Observation Haki in his situation.
It can be argued that Zoro needed Observation Haki too since last time he fought Mihawk he couldn’t even land a hit and Mihawk beat him with a small dagger, but I still think Armament Haki would be more necessary than Observation Haki if he was training with Mihawk.
TL;DR: Sanji specializes in Observation Haki because his training required him to focus on surviving/running as opposed to fighting, whereas Zoro specializes in Armament Haki because his training required him to focus on reinforcing his swords against Mihawk’s strong attacks.
*Theory made by Dereshishishi
What do you think about?
spoiler if you havent read the newest chapter: in the last chapter we got a small flashback to zoro’s training during the 2 years where he learnt from mihawk how to make it so his swords dont break, since zoro’s swords broke alot mihawk thought him that he has to use haki on his sword in a way, so i think its almost like armament haki but in another way 😛 so that is one haki zoro has atleast and since mihawk though him that i think he has learnt some other haki stuff too 😛
On Punk Hazard we saw sanji used his observation Haki and, like the post before, Zorros Armor Haki, this could be truth. Although only Oda know the truth ^^
if you will go back, it is true that zoro only trained with 2 people, however, zoro came to an island or castle where there are babboons that imitate the moves and techniques of mihawk so i can definitely say that his Observation Haki was specialized. I think that he mastered both as compared to sanji which i agree with this theory.
I respect that theory, but knowing that Zoro is the Vice Captain. I think it is a requirement that he also learns Observation Haki. Just like Rayleigh, a vice captain needs to be strong enough to protect his comrades in case of the captain’s absence. But it is also a possibility that your theory is right, but here is another thing, what if he’ll learn it some time in the future. maybe not just now, because zoro will be overpowered if he already knows Observation Haki right.
Which reminds me of Fishman Island Arc. didnt he sensed a presence inside the castle? which means that could be observation haki right? just wondering.
Maybe he already learned 3 forms of Haki. We dont know.
I think zoro already has observation haki; Remember his fight with Mr 1 in alabasta? He learned how to sense everything around him and cut through steel as well.
Also luffy asks sanji and zoro if they can sense a wild animal in the palace. In the fishman island, near the end of the ark at the palace when they are relaxing. fyi they both sit up and say yes….