This short animation by an amateur animator (Saruhan Saral) perfectly describes what the confrontation between the Mightiest heroes of DC and Marvel would look like.
Here's The clip -
It's a surprise that this video hasn't "gone viral," Created using Blender and After Effects this video took 3 months to make. This video is the literal definition of awesomeness and it's enough to fulfill our desire to witness a battle between Iron Man and Batman (or) Superman and Hulk. Yes, It's that awesome.