It's fact that Hashirama is stronger. However, I do question that fight. We have yet to see how Hashirama died, did a group of elite ninjas team up on him as well? Though we don't really know how far Tobirama is behind Madara and Hashirama, he was killed by twenty elites. Remember Madara is one man. He didn't have a village backing him, or even his clan. He was all alone. The last chapter revealed that he was already thinking about his dream. Faking a death so he would avoid fighting the ninja world[ (and all its elites) before his dream is not yet even remotely possible, doesn't seem like a bad idea to me lol.
Furthermore, it seems like Madara fought Hashirama, Tobirama, and several other senju. That whole fight at the valley of the end seems rather shady, in light of recent evidence.
Again, Hashirama is stronger, that much has already been said. It's just that Madara's loss at the valley of the end may have been planned.