Affleck via EW:
And the character is very different, too. “BvS departed a little bit from the traditional Batman,” says Affleck. “He started out with all this rage directed at Superman, because of his coworkers who had died in the fight Superman had with Zod.” For Affleck, most of the hero’s ensuing actions were defined by barely-repressed fury – in contrast to the Batman we meet in Justice League. “He was holding on to a lot of anger, in a little bit of an irrational way,” Affleck says. “Whereas this is a much more traditional Batman. He’s heroic. He does things in his own way, but he wants to save people, help people.”