We've seen Luffy having problems dealing with Cracker alone,say Zoro fights Cracker,would Zoro be able to deal with him alone? I honestly believe Zoro would be able to slice through his shields!?
Zoro specializes in armament haki to a better degree than Luffy, right? He should be able to cut through the biscuits reliably, though whether or not he can survive Crackers' hits is a deciding factor. With Asura I could see him simply breaking everything that comes at him while advancing on Cracker for the oneshot, Crackers a leaf when it comes to damage.
idk if it was ever said that Zoro has stronger haki it was only said I think that he owns both CoA and CoO Can he break the haki of Cracker though?
Don't see why not. Cracker didn't appear to have a higher tier like Katakuri to observation, as far as I recall.
The latter. Swords give Zoro an edge (pun unintended) being able to more easily get to the main body.
Luffy uses armament haki all the time so i don't think zoro specializes in it more than luffy. Zoro can just cut through things so it makes matters easier for him rather than luffy punching his way through. Zoro could probably take this given the fact that he wasn't even pushing himself during the fight with pika but then I'm not 100% sure he would win since we all also haven't seen him go all out.