I went through this very exercise and ended up with a 2011 X6. In fact, I had a Cayenne Turbo on order and ended up changing my mind and going for the X6.

I think the new Porsche interior is gorgeous for sure; however, I would give the nod to BMW technology all day long. I really love the new iDrive as well as features like the side view cameras etc. I personally feel iDrive beats the PCM system hands down. Obviously a very personal preference

I also could never fall in love with the new Cayenne's shape. I think it is has been softened too much, and quite frankly it looks like a number of Japanese SUVs from the rear. For me the X6 - while certainly controversial looking - makes a much bolder statement, is more aggressive, and frankly more unique. When I walk up to it, I get a smile on my face. Something that I never could do with the Porsche.

I also feel that Porsche simply cannot compete with BMW in the bang for the $ department. For me it was not so much the high price tag of the Porsche, but rather the feeling that I was not getting what I was paying for. Simple things like charging $700+ to get the side view mirrors fully painted just left me feeling ripped off.

At the end of the day I realized that the X6 50 had more than enough power for me, and honestly I enjoyed driving it more than I did the Porsche Cayenne - even the Turbo.

Having said all of this, the Porsche is no doubt a great vehicle and you really cannot go wrong with it if it is the one calling out to you. Do however be aware that options will run up the price quickly, and they will depreciate equally quickly.

Hope this helps

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2011 X6 xDrive50i - Titanium Silver/Black Nevada/Bamboo.
Loaded except: Smartphone Int, Heated Rear Seats, Rear Ent, Lane Dep, SC Doors, 20" Wheels
2008 Aston Martin Vantage - Black/Black
Loaded