Naturally the aerodynamics of a helmet have an impact on wind noise and the aerodynamics are effected by your riding position to some extent. I would guess the higher end helmets are designed around an aggressive riding position and may not be all that great for someone with a more upright position.

I found this was very true with motorcycle helmets. The one that worked the best on my sport bike was not good at all on my bike that was more of a standard. Just wasn't designed for that.