For Off Road forget the spool, it's only being used in touring cars.
Diff is your safest option, it will provide a car that is easy to drive, as well as more control in the air, and easier braking (4-wheels are all braking).
One ways free the front wheels up under braking, gives more turn in, but less air control and since only the rear wheels are braking, a less stable car under braking.
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