I got a PP and it's great, but I occasionally think I wish I had the premium since you can upgrade the suspension pretty easily. To me, the PP really felt like a good value vs. the premium. If I was buying again, I'd probably stretch a little and get both. If I had to pick one, PP again.
I had the option for either or. I couldn't afford both (I can now, go figure). I went for the PP. I wanted the better wheels, and performance upgrades. It felt silly to get a Mustang and get comfort options before performance options. That, and the base GT felt too boaty in corners. The PP felt right. I then went in and added a subwoofer. The only real thing I miss from the premium is the screen.