First, family background. Batman was born from a rich family, he has his own home and he had enough to fulfill his needs. While spiderman is just a simple guy from simple family even after his parents left, he need to live with his aunt and uncle.
Second, the process till they become heroes. Batman was found by Ra’s Al Ghul and trained to eventually possess the skills of Batman. He's not like the other superheroes. While spiderman was