I ordered grey as well but I think it's because apple has marketed it more this year. And I fell for it! I had the silver one last year and wanted gold. My boyfriend has the gold 5s and preferred silver later but now I have fallen for the new marketing and I'm fine by that!
I think the gold on the 5S did it right, the new back of the Gold 6/6+ is a little much...not a huge fan of the back of the new iPhones in general but the gold seems to be the worst of the 3. Wouldn't really matter in the end to me anyway since have a case on 99.9% the time.
Both the gold and space gray looked better last year. I had the silver and regret not going with space gray so i ordered it this time but i just realized that the reason why it looked so nice on the 5S is because of the black on top and bottom. The bands shouldve been black. The gold isnt as nice because this phone is less classy.
I had a gold 5s, and i went with a gold 6. Gotta say, those white bands on the back of that gold 6 phone look ugly to me. Should have went with silver. At this point it does not matter, as once i have it in a case. I wont notice anyhow. But i do believe that after watching youtube reviews, that the space grey and silver would have been a better choice.