I've had both exhausts on my Cobalts -- Depends on where you drive your car and how much noise you can tolerate.
Performance exhaust Pro: is great around town has a nice healthy sound to it when accelerating. Con: at highway speeds lots of decibels...you will need to turn the radio up to hear it. If you are in hilly or mountain country the drone when the engine is under load (going up hill) at 70 MPH is really loud and annoying.
Touring exhaust: Pro: deep sound at idle and while accelerating, does not get loud while doing 70 MPH. Con: not loud enough if that's what you want.