Handling
With its tighter turning circle, the GMC is definitely more maneuverable than the Enclave, 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 Buick Enclave's engine is significantly smaller than the GMC Envoy's. Keep in mind that smaller engines can be stressed more; on the flip side, smaller engines are often cheaper to fix.
The Buick Enclave has no lessons to learn as far as pickup from the GMC Envoy.
Utility
The Buick Enclave will most definitely prove more practical than the GMC Envoy for those of you with frequent child-cargo.
The GMC Envoy outpulls the Buick Enclave by a massive margin.
Convenience
The GMC Envoy's fuel tank will need to be replenished a little more often than the unit in the Buick.
Comfort
While the front cabin in the Enclave offers a bit more head room than the Envoy, there frankly isn't much of a difference.
The GMC Envoy is not particularly more spacious for your passengers than the Buick.
Dimensions
The GMC Envoy and the Buick 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 Buick Enclave.
As far as fuel economy, the Buick has the GMC Envoy beat.
The Enclave won't save you much money at the pump compared to the GMC.
The Buick is considerably costlier than the GMC Envoy regarding MSRP.
Overview
The basic warranty that comes with the Envoy isn't quite as generous as the Buick Enclave's.