Since there will be no gold, I think I'll go with Silver/White. The super clean look is appealing to me and was last year too, but I was ready for a dark color (Deep Purple) after having a light color (Gold) the year before. I'm tired of the dark Deep Purple right now. I like the color blue in general but I'm not really a fan of blue products. The dark blue is kind of appealing since it's the only one that's not grayscale. But I can see it being similar to Deep Purple where it's really nice in bright light but desaturated and blah looking in all 95% of normal lighting conditions.
I really don't like the Titan Gray. It reminds me of the iPhone 6 which I think is the ugliest iPhone of all time. And it reminds me of when Macs and iPhones were all only that color. I guess it still feels tired for me. Same with Space Black. I would've loved the matte black 5-10 years ago, but I've just gotten very sick of all black phones. I haven't had a Silver/White iPhone since the iPhone 4S, so it's been long enough that it'll feel fresh to me.