Which story from Life of Pi do you believe is real: the story with animals or the story with humans?

In my mind, the story that is of course more likely is the
story involving the people, the chef becoming the cannibal and in the end Pi deciding
that he is going to have to resort to that in order to survive.  The fact is that humans
will go to incredible lengths, positive and negative, when it comes time to survive,
they begin to act far more like animals.  So Pi describing them as animals instead of as
humans makes a great deal of sense and makes for an amazing story.  It is also in some
ways easier to believe or accept than the idea of humans eating each other and Pi being
in a situation to have to watch his mother being eaten, these things are hard to wrap
your brain around.