(all bottom lines in this thread are the posters opinions of the 2 cars)Porsche Cayenne Turbo S: 520hp, 0-60mph in 4.8 secs, 168mph (270km/h) top speed bottom line: everything u would from a Porsche, but looks too bland... Mercedes-Benz ML63 AMG 503hp, 0-60mph in ABOUT 5secs, electronically limeted 155mph (250km/h) top speed bottom line: my type of car!