Performance differences are negligible. I have been to the track many of times with the fastest SHO's out there. PP have a edge on 60' times. By about 1/10 of a second, there disadvantage is tire spin. The lower gear ratio makes more difficult to hook up. And our cars don't like excessive wheel spin and ECM will quickly shut you down. This has nothing to do with TC being on or off. It has everything to do with wheel speed difference between front and rear wheels.
But if I where in the market for a new SHO it would be a PP car for all the additional add on they come with now.