Handling
With their similar turning circles, the GMC Yukon and the Lincoln MKX most definitely handle approximately the same into and out of tight spots.
Drivetrain
The Lincoln MKX's engine is significantly smaller than the GMC Yukon's. Bear in mind that a smaller engine usually has to work a little harder; on the flip side, smaller engines typically get better gas mileage.
Torque is the force that lets you accelerate quickly, and in this respect, the GMC Yukon is substantially more powerful than the Lincoln MKX.
Torque equals pickup, and the GMC Yukon will have picked up and gone by the time the MKX finally gets moving.
Utility
Drivers with frequent kid-duty might favor the GMC Yukon over the Lincoln MKX.
The GMC Yukon is likely a better choice than the Lincoln with respect to hauling capacity, especially if you often need to carry a lot of gear or sizeable animals.
Towing is substantially more the GMC Yukon's forte than it is the Lincoln MKX's.
Convenience
The Lincoln MKX's fuel tank will need to be replenished more often than the unit in the Yukon.
Comfort
Taller drivers will significantly enjoy the extra head room in the Yukon's front cabin compared to the Lincoln.
While the rear of the Lincoln MKX provides a bit more head- and leg-room than the Yukon, there honestly isn't much of a difference.
Dimensions
The Yukon is significantly heavier than the Lincoln MKX.
Your wallet will hurt more every time you fill up the GMC than the Lincoln MKX because of its bigger tank.
The Lincoln MKX and the GMC Yukon 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 almost the same to get the Lincoln MKX to the dealership as the GMC Yukon.
The Lincoln MKX won't save you much money at the pump compared to the Yukon.
The Lincoln MKX isn't much less expensive than the GMC with respect to MSRP.
Overview
The basic warranty that comes with the GMC Yukon isn't quite as generous as the MKX's.