Cayman more daily driver. Taller and easier to get in an out of. Much better creature comforts. Much more practical and more storage space. The 4c is more raw and more communicative. I really like how you can feel the front tires fighting you in the turns. That’s something we lost in the 80’s. It’s really light so you can push it in the corners. The 4c is more spirts car. The Porsche more GT.