Handling
With their comparable turning radii, the Highlander and the GMC Terrain likely handle about the same into and out of tight spots.
Drivetrain
The GMC Terrain and the Toyota Highlander have similar-sized engines, with a slight advantage to the Toyota Highlander.
Utility
Drivers with frequent child-duty might favor the Toyota Highlander over the GMC Terrain.
The Toyota Highlander is a better choice than the GMC regarding hauling capacity, especially if you frequently need to carry a lot of stuff or large dogs.
The Highlander outpulls the GMC Terrain by a large margin.
Convenience
You'll quite certainly have to take the Toyota for a fill-up more often than the GMC Terrain because of its tank size and fuel economy.
Comfort
While the front cabin in the Toyota offers a bit more head room than the GMC Terrain, there really isn't much of a difference.
The Terrain is not particularly more spacious for your passengers than the Toyota Highlander.
Dimensions
The Toyota Highlander is significantly more bulky than the GMC Terrain.
The Toyota Highlander's tank is about the same size as the GMC Terrain's, though the GMC Terrain's is slightly larger.
The GMC Terrain and the Highlander 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 approximately the same to get the GMC to the dealership as the Toyota Highlander.
The Toyota Highlander doesn't pale in comparison to the GMC Terrain regarding gas mileage.
The GMC Terrain isn't much less pricey than the Toyota Highlander when it comes to MSRP.
Warranty
The GMC Terrain and the Toyota Highlander have the same basic warranty.