According to ComicBookMovie on Jan. 19, with the anticipated release of Zack Snyder's "Batman vs. Superman" film, Mark Waid, currently the writer of Marvel's "Daredevil" and "Indestructible Hulk" comic books, explains the dynamic involving the Batman and Superman characters.
Waid was asked about the differences between the two and as far as their origins are concerned, they had come to heroism and their identities by somewhat different methods. Batman came into existence through the loss of his parents which entailed a tragic situation in his early life and vowed to never let that happen to anyone else from then on. Superman intends to simply have an overall respect for human life and wasn't driven into the preservation of life by the same motivations as Batman.
Waid contends that Superman wears no mask typically because he's built up public trust and is ability to be pretty much impervious allows him to casually and mild-mannerly resolve threats in a non-threatening fashion while the Dark Knight believes in using fear and intimidation to subdue his foes.
They both do share the desire to seek justice and fairness and that's the main thing in which they have in common.
The both can be analogous to that of the film "Rocky" where Paulie couldn't figure out what he saw in Adrian. Rocky explained that he has an attraction for "gaps". Basically, he contends that they fill each other's gaps and figures that how works. With Batman and Superman, one seeks justice by day while the other by night. Also, Batman can think like a criminal and thus can resolve criminal activities easily while Superman in no shape or form can have such a mindset.
They compliment each other in those regards.
"Batman vs. Superman" opens in theaters May 6, 2016.