Whenever an action crossover between two, or more, characters occur in any official material (not fan made), people tend to presume right away that it will be a definitive fight to the death with a clear winner and no bias towards one side over the other. While this mindset is not certain for some, most seem to think this would or should be the case, disregarding the fact that in most, if not all official crossovers have a thing called a narrative, story, plot, etc. Whatever you may call it, in official material, narrative is king, and so must be a justifiable excuse as to how two or more characters meet, why they meet, and why do they engage in conflict against one another.
Based on a bit of research and careful analysis, I've concluded that a majority of Vs. crossovers commonly have two scenarios that we might've seen before and be most familiar with. This may not entirely be the case as there have been exceptions, they are the few exceptions that proves the rule. Keep in mind