It is also very dependent on what incarnation of each individual character, as well as prep time. For example, I believe Superman Prime One Million would kill every Avenger instantly aside from the Hulk, which, due to his durability, would give a two or three punches before Supes killed him. Or, WB Hulk, who could arguably take each League member one by one with the exception of Supes or maybe Aquaman in water, assuming Hulk doesn't have his adaptability power in this incarnation, in which case, he could take Aquaman. Also, Rune King Thor and a Professor Hulk can take a normal Superman easy if they team up on him. This is just arbitrary rambling at this point, so I'll sum it up by saying that there is an entire extra variable that hasn't been defined.