I have ridden in both gto’s and sti’s. The gto drives like my crown vic only faster. The sti was more like a sports car and less like a grandpa car, like the gto was.
For just drag racing, I guess the GTO would be better but if you use the car as a street car, the STI is the clear favorite.
Plus the fact that I do not like GM cars, except for a very select few. 