Everyone's spending time talking about wether Rose Gold is pink or copper or whatnot, but let's get down to what really matters:
The GOLD model? Yuck!
Space Gray is professional, while Silver and Rose Gold are classy, but the Gold iPhone is just tacky and lame.
The color doesn't matter, it is all in the eye of the beholder. I can come up to you and say that your face is ugly, but somebody else might think you're good looking. Black doesn't always mean professional, black could also represent depression, I think white or silver is more like purity and cleanliness. But we're all entitled to an opinion I guess, it's just that not everybody needs to hear it.