I was tempted to say naruto but his reluctance to find and capture swayed me to sasuke he seems to be caring more and more about his brothers means and actions
I say naruto. Itachi really wants the 9 tails to himself. Thus his reluctance to tell deidara about the 9 tails and his recent mischief in the latest chapter. He wants to test himself vs the 9 tails. its obvious!