I own an '07 Escalade and an '06 X5 4.8is and they are very different vehicles. I actually love them both, but for very different reasons (although with the 22" wheels, we look a little "pimped"). The Escalade is more comfortable, very roomy and you glide through your driving experience. It is a very enjoyable vehicle. If I want to feel in control of the driving experience, have fun, feel the responsiveness of the vehicle and feel the power (and kick a little motor ass along the way) I drive the X5. Other than both classified as SUV/SAV, they are very, very different. If this helps, great, if you need more description, let me know.