5. It's not the end for either
It was no accident that the release of Batman v Superman: Dawn of Justice coincided with Easter weekend. The film ends with a shot of the dirt on top of Superman's coffin floating up from the ground, insinuating that he will return from the dead.
This happened before sometime, but who was it? Oh right, it was Jesus Christ! Jesus rose from the grave on the third day, and BvS just so happened to come out the one weekend out of the year that is celebrated most.