Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The Envoy is substantially cheaper to get to the dealership than the Mercedes-Benz GLK-Class.
The GLK-Class will save you money at the pump compared to the GMC.
The GMC Envoy won't tax your gasoline budget considerably more than the Mercedes-Benz GLK-Class will.
The Envoy isn't much less pricey than the Mercedes-Benz GLK-Class as far as MSRP.
Utility
Neither the GMC Envoy nor the Mercedes-Benz GLK-Class has a marked advantage as far as seating capacity.
The GMC outpulls the Mercedes-Benz GLK-Class by a large margin.
Convenience
You'll most certainly have to take the Mercedes-Benz GLK-Class for a fill-up more often than the Envoy because of its tank size and gas mileage.
Comfort
While the front cabin in the Envoy offers a bit more head room than the Mercedes-Benz GLK-Class, there frankly isn't much of a difference.
While the rear of the GMC provides a bit more head- and leg-room than the Mercedes-Benz GLK-Class, there honestly isn't much of a difference.
Dimensions
Your wallet will hurt more every time you fill up the Envoy than the GLK-Class because of its bigger tank.
The Mercedes-Benz GLK-Class and the GMC Envoy compete for the same parking spaces.
Handling
With their similar turning radii, the GMC Envoy and the Mercedes-Benz GLK-Class most certainly handle roughly the same into and out of tight spots.
Drivetrain
The GMC Envoy's engine is considerably bigger than the Mercedes-Benz GLK-Class's. Note that more massive engines may use more gas than smaller ones.
The Mercedes-Benz GLK-Class has no lessons to learn as far as pickup from the GMC Envoy.
Warranty
The basic after-sale protection that comes with the GMC Envoy isn't quite as generous as the Mercedes-Benz GLK-Class's.