Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs roughly the same to get the FX35 to the dealership as the Mercury Mountaineer.
The Mercury Mountaineer won't tax your gas budget considerably more than the FX35 will.
As far as MSRP, the Mercury Mountaineer doesn't cost much less than the Infiniti FX35.
Utility
The Mercury Mountaineer's more massive trunk will accommodate more massive objects than the FX35.
The Mercury Mountaineer will very likely prove friendlier than the FX35 for those of you with frequent child-cargo.
Towing is quite a bit more the Mountaineer's forte than it is the Infiniti FX35's.
Convenience
You likely won't have to visit your friendly gas station more often with the Mercury Mountaineer than with the Infiniti, as both offer comparable ranges.
Comfort
While the front cabin in the Mercury offers a bit more head room than the Infiniti FX35, there honestly isn't much of a difference.
The Mountaineer is not particularly roomier for your passengers than the Infiniti FX35.
Dimensions
The Mercury Mountaineer is likely to feel a little sluggish because of its high horsepower-to-weight ratio compared to the FX35.
The Mercury Mountaineer's tank is roughly the same size as the Infiniti's, though the Infiniti's is a little more capacious.
The Mercury Mountaineer rides lower than the Infiniti, which is a good thing for its center of gravity and ease of access.
The Infiniti and the Mountaineer compete for the same parking spaces.
Performance
The Mercury Mountaineer is likely to feel somewhat slow because of its high horsepower-to-weight ratio compared to the Infiniti FX35.
Handling
The Infiniti and the Mercury Mountaineer have roughly similar tires.
With their comparable turning circles, the Mercury Mountaineer and the Infiniti FX35 likely handle about the same into and out of tight spots.
Drivetrain
The Mercury Mountaineer's engine is substantially larger than the Infiniti FX35's. Note that more massive engines may use more gasoline than smaller ones.
The Mountaineer has no lessons to learn as far as torque from the Infiniti FX35.
Overview
The basic warranty that comes with the Mercury Mountaineer isn't quite as generous as the Infiniti FX35's.
Other
The Infiniti FX35 emits fewer smog-forming pollutants per 15,000 miles than the Mercury Mountaineer.