Clear. IMHO. The chrome will continue to glisten through them? And, they'll provide no interruption to visibility through them?
A FULL set can be adjusted to not buffet the passenger, and yield/prevent cooling airflow to either person, as desired.
That's a tough question because it's a matter of personal taste. I would consider the clear or the dark smoke. Here's the difference: the clear tends to make the wings disappear. They don't affect the overall appearance of the bike because when you look at the bike you see through them. The dark smoke makes them noticable because you see them.
I have a yellow bike. I considered the yellow wings but they were much too strong a color and I felt they clashed with the color of the bike. So I went with the dark smoke. If I were buying them again I think I'd go with clear.
I've seen the clear wings on a white bike and they look good. so they would be my choice.
I can't tell you witch looks better . I put dark on mine I don't think they look good or bad . No one that has seen my bike has said anything one way or the other about them . I like the black on white with just a little chrome here and there . I have a white 06. I got the dark black In the hope they would Not stand out but be neutral, worked for me I think.