Batman 3
Or
The Avengers
Right now I'm split between the two because Batman 3 will not only have Batman fans watching it but the people that loved "The Dark Knight." With "The Avengers" coming out I think that it will have loads of people coming to see it. This will include the Cbm lovers, the people who loved "The Incredible Hulk," the people who loved "Iron Man 1&2" and the people who loved "Captain America" and "Thor" if it does well enough.
So which will do better?