Black is the most popular color (don't know why)
But I think the Black hides many of the Raptor's design (especially at a distance) like the hood/fender vents fender flares, different grill, graphics, and bumpers. Since all these Raptor only pieces are dark-colored, get a brighter/lighter color to offset them, that way you truck looks like a Raptor at 50ft and at 10mi away....
Whenever I see other Raptors, I do the 'Jeep wave' or the 'biker wave' and spotting the Black ones is harder (Silvers are almost as bad).
Just my $0.02....