It would depend on if you're doing any other exterior body mods. If you plan on a different rear bumper, then the Cervini's one is not too aggressive. With the stock rear bumper, it makes the rear end seem off balance.
I went with the CDC one because it looked a little better to me. Plus, I have to admit I liked the Pony emblem. One thing though, the CDC one covers the stock 3rd brake light so if that is a concern you should go with the Cervini one. Or you can buy the optional CDC 3rd brake light, but that is going to cost more money.
I had my Cervinis Wing Molded to the car and it looks great with the stock bumber... I will be adding the cervinis valances to the rear bumper though so that I can install my side exhaust