Depends on what you want and can afford. The pedal commander is a basic throttle booster which makes driving the car more fun, but adds no power. The Diablo inTune tuner is a power adder with the option of boosting the throttle. I went with the inTune and a Hemifever custom tune where Sean boosted the throttle by 10% as part of the tune and I love the result. Either one is fine and as usual, you get what you pay for.