Squad: Sasuke, Tsunade, Naruto
Pein: The rinnegan as we know is called the powerfull eye technique between the 3. Advantage of this is that Pein can call up 6 bodies, thus making the squad larger.
Sasuke: Sharingan, he can use genjutsu and have been already stated before that he has more potentional than itachi, so he is better.
Tsunade: The best medical ninja ever, also can heal herself easily so she'll be the best backup..
Also her uber strength could be usefull aswell
Naruto: Unpredictable, kyuubi's power + Tajuu kage bunshin no jutsu.
making the squad even way larger and more powerfull.