Read this first:
I don't know if it has been done before but this fight seems quite interesting, so here it goes:
Batman and Superman have prep time. Batman have seen and study every one of the Avengers (Captain America, Iron Man, Thor, Hulk, The Black Widow and Hawkeye). He has developed an strategy for him and Superman to follow, and he has brought every possible gadget that can fit in his car and belt lol (He has studied every one of them so, yeah, there are very useful gadgets here). They are both fully prepared and ready to kick ass!
The Avengers know some about this two (although not much). They know that Superman is a really heavy hitter and that the Batman is practically unpredictable, but they don't know their particular weakness or what to do to take them down (Witch means there is no kryptonite here). The Avengers are assembled and ready for everything! Note: These Avengers are the same ones from the movie (Cap, Iron man, Thor, Hulk, Black Widow and Hawkeye)
So, what do you say? Can the World's Finest Superheroes beat The Earth's Mightiest Heroes? Leave me your opinion and your toughs about it. I'll leave mine for last :)