I think the decision has more to do with what you want from the car. Will the coilovers make the car look better and also handle better? Yes. But if you aren't someone that tracks your car, the majority of your purchase will be for the looks, which you never see when you are inside the car driving.
HOWEVER, if you get the exhaust you get to hear it every second you are in the car.
This is how I broke it down when I was choosing between coilovers or exhaust and because I don't track my car (yet) I decided the exhaust would be more satisfying. So if I were you I would consider what is more important to you and if you don't track your car I would find it hard to justify coilovers over exhaust.