Which is better and why?
Not prices... I'm talking quality!

/ The BMW quality is far more superior than the Yukon. You can tell this immediatly upon shutting the door, and listening to the vault-like closure.

After that, test drive the X5 at high speed, and note the sound quality and ride (with suspension control engaged).

Go to a BMW dealer, and check out the Service Department compared to the Yukon's Service Department.

The BMW dashboard, airbags, seats, vision, and spare tire ease are all superior to the Yukon.