Performance
With respect to horsepower, the John Cooper Works packs quite a wallop and will knock the Cooper down a few rungs. On the flip side, keep in mind that high horsepower engines often command higher insurance premiums.
Drivetrain
The Cooper could learn a lesson or two from the MINI John Cooper Works in terms of pickup.
Torque is the force that lets you accelerate quickly, and in this respect, the MINI John Cooper Works is tremendously more powerful than the Cooper.
Utility
The MINI Cooper and the John Cooper Works can accommodate the same number of passengers.
Convenience
The MINI John Cooper Works's fuel tank will need to be replenished somewhat more often than the unit in the Cooper.
Dimensions
The Cooper and the John Cooper Works compete for the same parking spaces.
Cost
The MINI Cooper won't save you much money at the pump compared to the John Cooper Works.
In terms of gas mileage, the Cooper and the MINI John Cooper Works don't differ much.
The MINI John Cooper Works is significantly costlier than the MINI Cooper as far as MSRP.
Warranty
The MINI John Cooper Works and the MINI Cooper have the same basic warranty.