This has come up before. I would say it depends on what you want in a car. As a track car the GT3 is better set up from the factory and it is going to be quicker in my opinion, regardless what member experiences are to the contrary. Given a good driver the GT3 is faster.

That being said, I think the 996 interior is very dated, and I could not really justify spending money on a car where every time I got into it I wondered why I spent so much money to sit in a car that looked and felt rather old and even cheesy. I was never a fan of the interior design in the first place.

I also think that for me, insurance and maintenance costs were going to be lower with the Cayman, plus I would have a longer warranty.

The Cayman is the better car for the street or as a daily driver, the GT3 is the better car for the track or if you just don't care about things like daily drivability.

IMO if you want a 996 for the street, you should look at a Turbo, it will be more fun on the street and is more daily drivable slightly.