It depends on what you shoot, how portable you want to be, and your post-processing workflow. 36 MP is a lot on a camera, and unless you need to crop a lot (and often) I wouldn't get one.
If I were you, I would go to your local camera shop and try out some Canons and Nikons and see which ergonomically feels good in your hands. Which features must you have, and which features are optional? Also, depending on what you're shooting, Canon or Nikon may have the better set of lenses for your needs.
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