A good one. Not much in price differential, the GT is 3.3, the F430 is 3.5s to 60 mph. The top speed 196-200 mph for the F430 and 200-205 mph for the GT. 1.4 mile times 11.7 s for the GT and 11.7s for the F430. Pretty much identical, but the GT has the edge. But the F430 has the best engine ever in my opinion. Even if it has 483bhp compared to 500-550bhp, and 343 ft. lbs. of torque compared to 500 ft. lbs. The F430 is naturally aspirated while the GT is supercharged. And the F430 is smaller in displacement. Both are V8's.
I don't think I can pick either one as the better, in performance.
In looks I definitely take the F430, so much more curvy, yet still aggresive, kind of like the
Porsche Carrera GT, another amazing supercar.