I cant really say from personal experience much, but a twin disc should have a softer pedal feel than a stage 3 single disc. I drove a buddies '11 GT500 and it almost felt softer than my stock one in my 2000 GT.
Sold - Black 2000 Mustang GT, gone but definitely not forgotten
- Silver 2007 Corvette
Current - DHG 2001 Bullitt