personally I like red it's my favorite color, but What color do you like better? btw I found these not to be dock friendly. Also some headphones don't fit good. and lastly your signal will be affected by this.
I personally think the Vapor Pro is an extremely overpriced bumper and you should just avoid it altogether. But if your phone is white, go with the white. If you phone is black, I think the red would look better.
EWW... those cases are probably the the most ugliest cases i have seen for the iPhone 4. Please don't abuse your phone by putting that case on PLEASE!!!!