What I could read the blue ones are great cause they have a very high contrast.
But I think all of them are at a high quality and the brightness is adjustable, too.

Personally I think it looks best if it fits your car's dashboard even if you say you don't care about that.

But you have the opportunity to cange the display. For only $40 you can order a different colored faceplate if you're not comfortable with the one you've ordered originally.

TeeMcBee