Pein wins this
-Deva and Preta can counter all of sasukes MS techniques comfortably,,,
-Even if the paths get hit by amaterasu,, they are still dead bodies,, as Preta can still absorb the flames,,, thus alllowing the paths to proceed on fighting,,,, Naraka path can hide behind some summon such as bird,, as animal path along with naraka and possibly shurado,,, can fly out of the range for Sasuke,, and thereby shurado and animal,, can put sasuke on the defensive through missiles and multiple summons that are definitely superior to sasukes,,,
-Sasuke lacking the legged susanoo variants theereby makes him quite vulnerable to deva paths attacks as deva can still pull sasuke out of his susanoo,,, through BT,, devas boss sized ST can still destroy most of sasukes susanoo bar possibly V4 which he coulsd barely maintain in his MS form,,,,
-With animal summons forcing sasuke to use susanoo and amaterasu, along with shurado missiles,, preta countering most of his MS jutsu,,, naraka path ready to revive any of the fallen paths,, and deva path firing ST/BT,, sasuke is put on the defensive as this battle is definitely prolonged, somehting which hurts sasuke extremely since the drawbacks of using his MS techniques simply gives Pein the advantange,,,,
-Pein can also summon GM,,, as i really dont see what counters does sasuke have against soul dragon,,, Pein can also use CST from poiint blank range,, though that hurts Nagatos lifespan, i dont see what sasukes defenses have against something that destroyed an entire nation,, at point blank range,, it'll eliminate sasuke,,, or if only deva is remaining, he can use CT which sasuke has no realy counters for as his YM and Susanoo simply lacks the offense to destroy the orb, and the defenses to survive the attack