Being old school, I prefer the original design. For those that haven't seen the original, the bad guys had the blue bikes. The color of Tron's (Bruce Boxleitner) light cycle was orange. Flynn's (Jeff Bridges) bike was yellow. RAM's (Dan Shor) light cycle was red.
Here's the Tron Legacy version of the old design:
A white light cycle . . . bet it leaves behind a really bright light wall!
Edit: Apparently the white light cycle above is considered a "Second Generation" light cycle, probably designed after the events of the first movie.