After a million discussions on /co/ relating to this image, I see two possibilities
Possibility 1, and the most likely.
Cap and Superman apologize and buy each other drinks
The Marvel side gets its shit pushed in, and here's why. You've got>Black Widow>Iron Man>Hulk>Thor>Rogue>Captain America>Wolverine>Spider-Man
versus>Superman>Batman>Martian Manhunter>Power Girl>Flash>Aquaman>Green Lantern>Wonder Woman
Batman can solo three of those by himself, and the DC side has four who could conceivably solo the entire Marvel side by themselves. But of course, that would never happen, since Cap and Supes are utterly bro tier