Personally I'd take the Kinect if just for voice commands and motion control. From what I've seen the graphical difference between the PS4 and XOne are so minimal it's not even worth noting.
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The lack of power affects more than just the resolution.
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I have both (as I've stated many, many times), and this "vast lack of power" with the Xbox One is grossly over-exaggerated.
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Almost 50% is over-exaggerated.