With a D600 I would recommend that you give Aperture a wide berth (assuming you cannot trial it these days). The D600 NEF conversions are ghastly IMHO and fixing the inevitable vignetting is a painful process. There is also way more support for LR4 including on Nikonians.
Aperture was on the point of reducing me to using JPEGs with the D600, when Nikonians helped me see the light, as it were.
LR 4 smokes Aperture on skin tones and replicates the Nikon camera modes, should you want to use them. I find it is far better at fixing highlights and shadows too. With LR the dynamic range of the D600 is staggering.