I would skip over both of those options and just get this
MSI GS60 Ghost Pro-052.
This one has the GTX 870M, but no 3k display, so it's $300 cheaper.
The 3k display doesn't make much sense. It's a gaming laptop, but even with the powerful graphics cards in it, it isn't going to be able to game at 3k resolutions. It's just too much. A desktop even struggles with that sort of graphic intensity.
The GS70 is somewhat of an annoyance, too. The GS series is supposed to be compact and portable, but even if its the slimmest and lightest 17.3" laptop in the world, it's still clunky to lug around being that big.
I feel that the portability and higher end graphics card in the GS60 Ghost Pro-052 is the way to go. You get the best specs, the most portable machine, and don't have to pay for useless features like a 3k display that you can't game on.
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