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Oakley Expert
So, pretty much what everyone said on here already. The MD has more of a wrap and is a more aggressive style in my opinion. The MP is more squared off and is a little more subtle than the MD. Whatever style you choose, both are very comfortable and can be worn for good lengths at a time with no discomfort (bear in mind as long as they fit you). I don't have any white pairs of each but here is my ugly mug wearing both:
MD
MP
MD
MP