Originally Posted by BMWMilan
Based on looks alone, I would choose the M6GC.
Based on driving experience, it would be the Panny GTS.
If I were you, I'd just buy both.
Driving both next week and will definitely let you know how it goes. I can't get enough of the M6GC looks and I am loving the 4WD and roar of the NAV8. Going to be a tough decision, they are exactly the same price spec'd.