Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The Jeep is substantially cheaper to get to the dealership than the Mercury Mariner.
As far as gas mileage, the Jeep Compass and the Mercury Mariner don't differ much.
The Mercury Mariner won't save you much money at the pump compared to the Jeep Compass.
The Jeep Compass isn't much less costly than the Mercury Mariner when it comes to MSRP.
Utility
The Mercury Mariner and the Jeep Compass can accommodate the same number of passengers.
Convenience
You will definitely have to visit your friendly gas station more often with the Jeep Compass than with the Mercury Mariner.
Comfort
While the front cabin in the Jeep Compass offers a bit more head room than the Mercury Mariner, there honestly isn't much of a difference.
The Compass provides more head- and leg-room to your passengers than the Mariner does.
Dimensions
Your wallet will hurt more every time you fill up the Mercury than the Jeep because of its larger tank.
The Jeep Compass and the Mercury Mariner compete for the same parking spaces.
Performance
With respect to horsepower, the Mercury Mariner packs quite a wallop and will knock the Jeep Compass down a few rungs. However, bear in mind that high horsepower engines often command higher insurance premiums.
Handling
With their comparable turning circles, the Jeep and the Mercury most definitely handle roughly the same into and out of tight spots.
Drivetrain
The Jeep Compass and the Mercury Mariner have similar-sized engines, with a slight advantage to the Mercury Mariner.
Warranty
The Jeep and the Mercury Mariner have the same basic after-sale protection.