who would win?
Superman definitely. Superman is way too fast and too physically powerful for any Akatsuki member to handle. There is really nothing stopping Superman from simply blitzing every single one of his opponents before they can even realize they are in a battle. And I highly doubt that any of the Akatsuki will be capable of surviving the full scope of his Heat Vision which has been stated to be immeasurable and hotter than the Sun. The Man of Steel has countless ways to pick up a victory. He can simply hammer on the Earth with all of his might, effectively shattering the planet. No Akatsuki member has the durability necessary to survive that kind of collateral damage. And its not like he'll need to do so. A simple speed blitz will do.