What Better? Gold or Grey Titanium coat on TAC 11

Hi, all,
My question refers to the fact that Tom Johanning's Tac 11 is available in 2 colors of Ti coating, and I'd like to know which is better and why? or if there are advantages or disads to both (beside the fact that one is less reflective, that is) thanks. I know they are different alloys or something.

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EdRozen-On the cutting edge of finding out what the cutting edge is....
 
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