They seem equal I give my analysis first then you judge:
Sasuke: a tactician, his Chidori would post a threat to both human and naraka path due to their lack for good defence, but it'll be useless against Preta path,Deva, Asura, and animal (the two latters because of their defence), Amaterasu would work great against animal path, and maybe preta path, but not quite against Deva path, His susano'o would make great defence against shinra tensei (weak version) Animal summons ...so he's in average has the upper hand against 3 paths.
6 paths of Pain: needless to say their powers, they'll post a great threat to Sasuke if weren't aware of each power earlier and their revival by Naraka path would make Sasuke had a hard time, but he'll mostly get 4 (Asura, Animal,Naraka, Human) down ....so it's 51% to Pain, 49% to Sasuke ... +rep because this vs wasn't a flame war field