I've got both shaft and belt. The belt is a little more solid... but the shaft is quicker to put down the power when you need it. The split second difference does not really account for much though. The shaft drive will give you a solid accel curve which can be very nice in the flat stuff... but the belt will give you the variance which is a little more forgiving to the animal drivers. With the right setup, you can't tell which is which unless you know the car.
Personal preference: Belt
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