i would think madara
It seems like Madara was stronger than Pein in the end. Naruto defeated Pein/Nagato. I'm sure Pein/Nagato would have put up a good fight against Madara but if he was defeated by Naruto, I doubt he would have won against Madara. Also, note that even Konan's ultimate technique didn't bring Madara down. So I think Madara is the stronger one.
madara no question cause he has eternal mangekyu
Yes pein get killed by naruto this computer wants you to vote madara look at your back
no prbily madara sharigan vs nagato reggiengen the reggienn can freeze your opponet
the known akastski leader is pein i believe that the main leader is not pein....but...... TOBI.... who is actually Madara Uchia
Pein is, but he gets orders from Madara Uchiha.
Disappointed that he lost his important pawn
Naruto would defeat Pein. Because when he is in Sage Mode + 8 Tails, Pein could hardly fend off. Pein was forced to run when Naruto went 8 Tails, so when the manga has finished, more definite answers, it should be published. But my conclusion is Naruto defeats Pein. Naruto wont defeat him Madara Uchiha will because Madara is the only person to face the nine tailed fox by himself and live.
Pain
It will be a tie
Sasuke and Madara are both extremely powerful. However, it is most likely that Madara would win, as he is probably a bit more experienced and stronger than Sasuke. Although it would certainly be a close fight.
no it is rumered that Tobi is madara uchiha in obito's body but no pein is not obito