People are mid understanding brehs when they say batman will use prep time. They seen saying he himself will go against them one on one an beat them. They are saying he will use people, location, planning and all of his resources to fight any opponent. For example if the marvel and dc worlds collided and he if he gets called out my Hyperion or some herald level goon, he would probably make up a story to black Adam or war ready Wonder Woman saying that the herald wants to destroy there home ( kandaq, Amazons or where ever Wonder Woman resides) when these two are angry it takes ALL of earths Heros to calm them down. That's the difference when marvel characters get angry (besides hulk) they become emo and sulk when DC characters become angry everbody getting them hands.