Feel free to cherry-pick your favorite AMD Gaming Evolved titles - that doesn't change the fact that according to the majority of reviews out there GTX 1060 is faster overall, more power efficient, generally has an edge in terms overclocking headroom, launched shortly after Polaris 10 ('several months advantage to market = lie') and was available starting day 1 at MSRP with custom cards in stock. Despite all the FUD, it is a much better gaming card than the disappointing RX 480. Meanwhile NVIDIA has zero competition above $250 and a full lineup of FinFET mobile chips out (GP107 coming soon).
When my companies GPU is faster than yours it's because it's better. When your companies GPU is faster than mine it's because the game was optimized for it. It's a weak argument no matter which "side" you're on.