To answer OPs original question, I enjoy both cars. But, as I am more connected to the road inside a Porsche, I feel a lot lot more safer --- thus, the P-car wins. This car feels more raw and feels it's "on rails".
My Z is a keeper; however, I went to the Nissan dealer for something and made a mistake of checking the cabriolet. Now, I feel like trading my coupe for the cab!
For those people thinking about buying a p-car, my recommendation is "unless you are mechanically inclined, or if you can't afford to pay mechanical mtce, don't buy a p-car.
For reference, 10+ years ago, a tune up at the dealer was around $1,000.00.