Handling
With their similar turning radii, the Envoy and the Mercury Mountaineer most certainly handle about the same into and out of tight spots.
Drivetrain
The Envoy's engine isn't much larger than the Mercury Mountaineer's.
Torque is the force that lets you accelerate quickly, and in this respect, the Envoy isn't much more powerful than the Mercury Mountaineer.
Utility
Drivers with frequent kid-duty might favor the Mercury Mountaineer over the GMC Envoy.
The Mercury outpulls the GMC Envoy by a large margin.
Convenience
You'll most certainly take the GMC Envoy for a fill-up about as often as the Mercury Mountaineer.
Comfort
While the front cabin in the Envoy offers a bit more head room than the Mercury Mountaineer, there frankly isn't much of a difference.
The GMC Envoy is not particularly more spacious for your passengers than the Mountaineer.
Dimensions
The GMC Envoy's tank is approximately the same size as the Mercury Mountaineer's, though the Mercury Mountaineer's is somewhat bigger.
The GMC Envoy and the Mercury Mountaineer compete for the same parking spaces.
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 GMC Envoy to the dealership as the Mountaineer.
With respect to MSRP, the Mercury Mountaineer doesn't cost much less than the GMC.
Warranty
The Mountaineer and the GMC have the same basic warranty.