Performance
With that kind of horsepower, the Nissan Armada is a full-blown sportscar.
The Mercury Mountaineer is likely to feel slightly slow because of its high horsepower-to-weight ratio compared to the Nissan Armada.
Handling
The Nissan and the Mercury Mountaineer have approximately similar tires.
With its tighter turning circle, the Mercury Mountaineer is doubtless more agile than the Nissan Armada, something to consider if you do a lot of city driving; however, remember that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The Nissan Armada has a bigger engine than the Mercury Mountaineer. Keep in mind that smaller engines are often cheaper to fix, but a smaller engine usually has to work a little harder.
The Nissan Armada packs quite a punch compared to the Mercury as far as torque, which is roughly equivalent to acceleration.
Torque equals pickup, and the Armada will have picked up and gone by the time the Mercury finally gets moving.
Utility
The Armada's more sizeable trunk will accommodate more sizeable objects than the Mercury Mountaineer.
Drivers with frequent child-duty might favor the Nissan Armada over the Mercury Mountaineer.
The Nissan is a better choice than the Mercury when it comes to hauling capacity, especially if you often need to carry a lot of luggage or large dogs.
The Nissan Armada outpulls the Mercury Mountaineer by a big margin.
Convenience
You'll doubtless have to take the Mercury Mountaineer for a fill-up more often than the Armada because of its tank size and gas mileage.
Comfort
Taller drivers will quite a bit enjoy the extra head room in the Nissan Armada's front cabin compared to the Mercury.
The Nissan Armada offers more head- and leg-room to your passengers than the Mercury Mountaineer does.
Dimensions
The Mercury Mountaineer is likely to feel a bit slow because of its high horsepower-to-weight ratio compared to the Nissan Armada.
Your wallet will hurt more every time you fill up the Nissan Armada than the Mountaineer because of its bigger tank.
The Mercury Mountaineer and the Armada compete for the same parking spaces.
The Mercury Mountaineer's shorter wheelbase will give a more agile feel in daily traffic. On the other hand, the Nissan Armada is likely to have a smoother, more stable ride.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the Mountaineer to the dealership as the Nissan Armada.
The Mercury Mountaineer will save you money at the pump compared to the Armada.
The Mercury Mountaineer isn't much less costly than the Armada in terms of MSRP.
Regarding out-the-door price, the Nissan Armada costs approximately as much as the Mercury Mountaineer (though the Mercury Mountaineer is a little cheaper).
Overview
The Nissan and the Mercury Mountaineer have the same basic after-sale protection.
Other
The Nissan Armada emits fewer smog-forming pollutants per 15,000 miles than the Mountaineer.