Performance
When it comes to horsepower, the Cooper S packs quite a wallop and will knock the MINI Cooper down a few rungs. However, note that high horsepower engines often command higher insurance premiums.
Drivetrain
Torque is roughly equivalent to acceleration, and in this respect, the Cooper S is tremendously more powerful than the MINI Cooper.
The Cooper S packs quite a wallop compared to the MINI Cooper regarding torque, which is roughly equivalent to acceleration.
Utility
Neither the MINI Cooper nor the MINI Cooper S has a marked advantage when it comes to seating capacity.
Convenience
You most definitely won't have to visit your friendly gas station more often with the MINI Cooper S than with the MINI Cooper, because both offer similar ranges.
Dimensions
The MINI Cooper and the MINI Cooper S compete for the same parking spaces.
Cost
In terms of gas mileage, the MINI Cooper is a bit better than the MINI Cooper S, but not by much.
In terms of fuel economy, the Cooper and the MINI Cooper S don't differ much.
The MINI Cooper S is substantially pricier than the MINI Cooper as far as MSRP.
Warranty
The Cooper S and the MINI Cooper have the same basic after-sale protection.