Congrats for your new car. Both cars are special on their own way. The Camaro SS 1LE is the best performance car for the $. But Porsches are very special cars, just be ready to pay more for maintenance.
I owned a '02 Porsche Carrera and it was great at the track but very costly on repairs not very reliable but my actual Stingray Z51 is the same thing, great performer but very unreliable. My prior 5th gen Camaro ZL1 and my '11 Mustang GT 5.0 were more reliable and always had a smile while driving them without having to worry about maintenance costs. On my future I see a 6th gen Camaro SS 1LE or ZL1 great cars for the price. I love to glance and read about Porsche performance but no way I would go back to them or to a Corvette.
Please share us more about your experience comparing your Cayman to your previous SS1LE