Utility
Neither the Toyota Sequoia nor the Yukon XL 1500 has a marked advantage when it comes to seating capacity.
The GMC Yukon XL 1500 is likely a better choice than the Toyota when it comes to transporting cargo, especially if you frequently need to carry a lot of cargo or large pets.
Towing is considerably more the Toyota Sequoia's forte than it is the GMC Yukon XL 1500's.
Performance
With that kind of horsepower, both the Toyota Sequoia and the GMC are true speedsters.
Dimensions
Your wallet will hurt more every time you fill up the GMC Yukon XL 1500 than the Toyota Sequoia because of its larger tank.
The Toyota Sequoia and the GMC Yukon XL 1500 compete for the same parking spaces.
The Toyota Sequoia's shorter wheelbase may produce a less-settled highway ride but a sprier feel in daily traffic than the GMC Yukon XL 1500.
Cost
When it comes to MSRP, the Toyota Sequoia doesn't cost much less than the GMC Yukon XL 1500.
Handling
With its tighter turning radius, the Toyota Sequoia is most certainly more maneuverable than the GMC Yukon XL 1500, something to consider if you do a lot of city driving; on the other hand, remember that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The GMC Yukon XL 1500 has a bigger engine than the Toyota Sequoia. Note that smaller engines are often cheaper to fix, but a smaller engine usually has to work a little harder.
Torque is roughly equivalent to acceleration, and in this respect, the GMC Yukon XL 1500 isn't much more powerful than the Toyota Sequoia.
Comfort
Taller drivers will substantially enjoy the extra head room in the Yukon XL 1500's front cabin compared to the Sequoia.
The GMC provides more head- and leg-room to your passengers than the Toyota Sequoia does.
Warranty
The GMC and the Toyota have the same basic warranty.