Naruto Shippuden - Why Madara Uchiha Vs Pein?

Madara vs Pain ?The story is right away advent to a purpose anywhere you are made to wonder who spirit take charge of the Akatsuki. It is of lessons up for grabs to be present lone of two, either Nagato with his controlled bodies of Pein before Madara so really its a battle relating the greatest Sharingan user and the greatest Rinnengan user. So, which is additional powerful, Rinnengan before