The SS I assume is heavier, and not necessarily faster. That said I expect it handles better, Gm's magnet ride suspension is superior, standard brembos as well. All the car mag folks such as Randy Pobst(former race car driver) love it's handling. I would test drive them both in a manner that allows you to make an informed personal decision. If you didn't test the Sport to answer any of your questions than test drive it again. I will say this for our beloved Sport. I've driven aggressively on some hilly twisty's and was impressed for what it is. Also I do honestly believe that the transmission does adapt some and the car will behave better over time than when you test drive, and a lot better with a tune. The erratic behavior of the transmission gets less over time as it adapts, and will disappear with a tune. If the same price it's hard to argue against the SS, except for its looks, gas mileage, infotainment tech, and no AWD, all of which may not matter to you. Again your best bet is to keep test driving them until you can decide on your own. Heck, might even just come down to which car is more comfortable for you to sit in.