Two SUVs with some similarities, but otherwise different in most aspects such as the starting price, model year, horsepower, fuel economy, and maximum occupancy. First of all, the 2016 Porsche Cayenne is priced $35,600 lower compared to the base MSRP of the 2014 BMW X6 M, which is older by two model years. Also, the 2014 X6 M has a more powerful engine and gets 3 mpg less than the 2016 Cayenne. And finally, there is a difference in the number of passengers; the Cayenne seats one more the X6 M. Among similarities are the body structure, market segment, ground shadow size, and height.