Gold. I even prefer the look of the 5/5s/SE over the 6/7 series. I think it looks cleaner, sharper and a more beautiful design too. I'm not saying the 6/7 series are bad, just that the earlier iteration is superior looking, in my opinion.
Just purchased my first white iphone having never gravitated towards white devices before. Went for silver as its simple and classic. I really like the rose gold but its abit too pink for me. Kinda wish it was alittle more copper.
I didn't vote, but I think silver still looks awesome on the iPhone with this form factor. I also love rose gold (the color of my iPhone 6s). Hard to pick, but it's definitely between those two for me.