Hmm, at the moment it'd be quite impossible to know considering we haven't seen Sasuke in battle after the time skip. And Gaara is of course awesome, I mean he's the best in the village.
If I were to guess, I'd probably say Sasuke considering how Oda is building him up, he'll probably be powerful as hell. But I could be wrong, there's a good chance that it's Gaara too.
Not a single element is evil, and not a single element is good, they just are
This is my theory, this is my mind.
Element info will change every time my rank goes up.
Thanks to Serurarange for showing me the pics, and credit to Arlong Park for the creation.
Never mess with the best.