Simply Edo Madara. He is an Edo so he can heal himself. He got EMS, Rinnegan, Mokuton Etc. He never runs out of chakra.
He can use susanoo, Meteors, can create That forest thing of hashirama with flower that has the pollens which can sleep anybody who inhales it.
How can he win.
Use susanoo from the start. Then create the forest. Then the tobi will be forced to either stop inhaling or go intangible state. Now all madara got to do is spam meteors. Tobi cannot stay intangible for too long(Fact from tobi vs konan) So he will die soon. Then he can use izanagi and comes back to lyf. But all madara has to do is repeat this process and finally the victory will be his.
This is KONOHAAAAAAAAAAAAAAAAAAA!!!!!!!!