hmmm..

well I personally would take the new X5.
The cayenne just doesnt look up to date anymore.
The next 3-4 years will be very hard vor Porsche in terms of Cayenne sales, since the new ML and X5 are brand new models (G class should also be counted), better looking, and offer a much better performance.
And lets don't forget, the unanderstandable tranny problems.

The X5 4,4 of my cousin launches like a rocket from standing still.