Blue is one of the most difficult colors for the human eye to pick up, and also a color that allows the fewest wavelengths to pass (I used to to concert lighting for a living - flashbacks to Color Theory class!). White is better than blue.
I just had a headlight burn out and replaced both with Sylvania SilverStar sealed beam lamps. VERY nice, very bright, great definition and good beam pattern. Plug-n-play, too.