Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The Mazda CX-9 is considerably cheaper to get to the dealership than the Envoy.
Regarding MSRP, the GMC doesn't cost much less than the CX-9.
Utility
The Mazda will doubtless prove handier than the GMC Envoy for those of you with frequent child-cargo.
The Mazda CX-9 is a better choice than the GMC when it comes to hauling capacity, especially if you frequently need to carry a lot of cargo or big dogs.
The GMC Envoy outpulls the CX-9 by a large margin.
Comfort
While the front cabin in the GMC Envoy offers a bit more head room than the Mazda CX-9, there really isn't much of a difference.
The Mazda CX-9 offers more head- and leg-room to your passengers than the GMC Envoy does.
Dimensions
The Mazda CX-9 is a tad heavier than the GMC.
The CX-9's tank is roughly the same size as the GMC Envoy's, though the GMC Envoy's is a little larger.
The GMC Envoy and the CX-9 compete for the same parking spaces.
Handling
With their comparable turning circles, the GMC and the CX-9 quite certainly handle approximately the same into and out of tight spots.
Drivetrain
The GMC Envoy's engine is substantially more sizeable than the Mazda CX-9's. Keep in mind that larger engines may use more gasoline than smaller ones.
The CX-9 could learn a lesson or two from the GMC Envoy as far as pickup.
Overview
The Mazda CX-9 and the GMC Envoy have the same basic after-sale protection.