Easy. Madaras had huge arms comming out of the kyuubis back holding extra PS swords. And the body armor was more detailed.Give me a solid reason why it shouldn't be on Madara's level... There regular Susanoo were easily the same in terms of Durability Speed power and in everything else... So tell me why would his Perfect Susanoo be superior to Sasuke's in anyway considering that fact his regular Susanoo wasn't...