While the GT2 RS packs 611 horsepower at the rear, and weighs 3,170 pounds, the Ducati's power-to-weight ratio is even better, with 192 horsepower on tap and just 415 pounds curb weight. That gives the Ducati a stunning power-to-weight ratio of 2.16 lb/hp. That's 3.82 fewer pound per horsepower than the 911.
On the other hand, the GT2 RS has a lot more rubber in contact with the road--even if it has a hard time using it. It's also nearly impossible to wheelie and flip over on a hard launch, unlike the Ducati. Not to mention the Ducati could tip on its side.
Which will win--grip and stability, or power-to-weight? We won't spoil it for you, but the answer is pure math, and good entertainment.