Both are great options and there's not much in it in terms of comfort. The Jaguar probably just about edges it and although the Porsche is better built, the F-Type will feel more luxurious and more special. If daily comfort is high on your agenda, that budget will also get you into the excellent BMW M2 Competition, which will be roomier, easier to get in and out of and more practical, but it might not feel as special as a purpose-built sports car like the Cayman and F-Type.