Why do we still even argue about this? Both of them are sealed, and we'll only see them in flashbacks, most likely.
For the nicknames, I don't find that an exaggeration because if they thought Hashirama's power was a fairy tail, what would make them believe in the SO6P?
And it really does not matter. We only debate about this so we can find who who is the strongest Hokage, right? Well, both of them will most likely be surpassed. If Naruto becomes Hokage he will most likely surpass both of them. Younger generation usually ends up surpassing the older generation.
This argument really does not matter. I find it does not matter because IMO, this thread is worse than the Tobi Identity threads. <--- That's my opinion, and I find it that bad. U_U
P.S. For the Hashirama and Hiruzen people who argue about this, don't call others stupid because of their opinion. :|