Who is stronger pain or Tobi?

Answer 1

Pein or Nagato himself was much stronger than Tobi himself, Nagato had the rinnegan, and tobi had only the mangekyou sharingan, now that Nagato is dead, and tobi has stolen his eye and he has made every jinchuuriki a path of pain he is stronger, but not himself, his paths, so Nagato(Pain).

Answer 2

Tobi is not Madara Uchiha but Obito Uchiha, Pain has taken orders from him because

1. He believed he could make peace by following him
2. He believed Tobi was Madara Uchiha, who is stronger than him

Answer 3

of course pein is stronger. when pein attacks the leaf village tsunade runs out of chakra and goes in coma