I like Kakashi the best, his taijutsu and versatility is beast.
I also love the 4th Raikages style, the savageness, the anger management issues, the recklessness. It's too much.
I think Killer bee has the most frightening fighting style with his 7 swords style, it's pretty much undefendable. The Sharingan can't follow the movements then that means everyone is screwed.
Itachi as well because he has so much style, grace and flair. Plus when he fights he never looks like he is trying.