Drivetrain
The Toyota Sequoia's engine is significantly smaller than the GMC Yukon's. Note that smaller engines can be stressed more; however, smaller engines typically get better gas mileage.
Torque is roughly equivalent to acceleration, and in this respect, the Yukon isn't much more powerful than the Toyota Sequoia.
Utility
The Sequoia and the GMC Yukon can accommodate the same number of passengers.
The GMC Yukon is a better choice than the Toyota Sequoia as far as transporting cargo, especially if you frequently need to carry a lot of stuff or massive dogs.
The Sequoia outpulls the GMC Yukon by a big margin.
Convenience
The Toyota Sequoia's fuel tank will need to be replenished slightly more often than the unit in the GMC Yukon.
Comfort
Taller drivers will considerably enjoy the extra head room in the GMC Yukon's front cabin compared to the Toyota Sequoia.
The Yukon provides more head- and leg-room to your passengers than the Toyota Sequoia does.
Dimensions
The GMC Yukon's tank is about the same size as the Toyota Sequoia's, though the Toyota's is slightly bigger.
The GMC Yukon and the Toyota Sequoia compete for the same parking spaces.
Cost
Producing an accurate fuel economy evaluation is so difficult that some think not even the federal government can do it, but it looks as though both the GMC Yukon and the GMC Yukon perform approximately similarly in terms of gas mileage.
As far as MSRP, the GMC Yukon doesn't cost much less than the Toyota Sequoia.
Warranty
The GMC Yukon and the Toyota Sequoia have the same basic after-sale protection.