To start, my main issue with Kakashi becoming Hokage is that it has become a very likely possibility when we're at the end of the manga. In other words, I've been waiting 15 years for Naruto to become Hokage at the end, only for Kakashi to step in and become Hokage because Obito told him to. What the fuck is that shit, how is that even remotely acceptable to you?
Hashirama is much more level headed, based on what? When he's nothing fighting, he's more outgoing than Naruto. When both are fighting, they're serious. As would be expected. Naruto has a stronger personality that Hashirama, he doesn't succumb to weird bouts of depression (which are for comedic effect, I know), and actually gets forceful.