It usually doesn't matter because the colors are chosen by the manufacturer. Often you get the 'Ford' choice, i.e. you can have any color as long as it's <place trendy color here but it will probably be black>. I've noticed over the years that bikes tend to be black, white, blue, silver or red. They may be some combination of those colors but that the usual color scheme. I've owned 32 bikes and I've had 4 that weren't those color.

I don't think it makes that big a deal on the road either. Bikes are so small that motorist don't really see the bike or the color. They see the rider. Bright clothing there can make a difference but the bike? Not so much.