If you smashed the two together which one would survive??
That's the only way to find out which one is the killer. Other than that choose your camera by what options and strengths make you the most happy.
All of the current high end Dslr's are great cameras in their own light and do different things better than the others, it's just which things you like the most.
Me I like dependability, and not having to run for fear when a little drizzle, snow is out in a cheap(comparatively speaking) model.