I'm going to throw out a vote for white. Here's my reasoning:
I currently drive a black F150. It's simply impossible to keep clean. I'd hand wash, detail it... Get it looking slick. Take it out to run some errands for a couple hours, by the time I'm back it's dirty again.
I also love the contrast you can get with the Raptor. With the non-black/gray colors, the grill, fenders, wheels, and applique stand out. Whereas with black, it's a very muted vehicle. I can spot a white Raptor a half mile away, whereas with black I have to almost be on top of it before I realize it's a Raptor.
That being said, I was set to get a white Raptor when I hit the dealership to submit my order. But fortune would have it that they had two white Raptors sitting on the lot, and.... Well, white just wasn't doing it for me. So I called an audible and ordered Performance Blue.
But it's a Raptor, so hard to go wrong regardless of color choice.