On a stage 2 tune, there is not much difference between the wrx and sti... even on the newer wrx numbers are some how close to Sti. I would say what you get more on the Sti is a bulletproof transmission, stronger drive train and bigger brakes. So i think is safe to say if you are just looking to buy a fast daily go with the WRX, if you looking into dumpmoney and make serious numbers gotta get that STI