Dynamically superior? Pssh. Not stock at least. A tamer ride in the rain is about the only thing a Cayman has over the 911.
I actually cant think of a way to design a course or slalom where the Cayman comes out on top. The power, breaking, tires, wheelbase, lower height, and better launch traction from the rear engine are too much to overcome.
And Ill pretend you didnt mention the Boxter in the same sentence.