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The gloss rock is going to be closer to Nardo and the gloss dark will be closer to Audi Quantum grey. The darker likely being a bit more green based. Both are nice, just personal preference.
Prior to making the jump to a MYP, I had an Audi SQ8 on order with a custom color, Nardo Grey. It's normally only offered on the RSQ8, but you can special order it on the SQ8. After I saw a Nardo SQ5 and my buddy said "oh you want gloss primer?", I changed my mind! I do like the Nardo, but I think I'd tire of it quickly.