I have not owned a Cayman but my first 911 was a 991 Carrera for 14.5K miles then moved on to a 991.1 C2 GTS for another 14K miles and then last May a 991.2 C4 GTS in which I have now done 10.5K miles, without any question the latter is the best car for me, it's faster, more economical and better infotainment equipped with the PCM 4. My car has a very high spec. Rear Axle Steering, PDCC, PCCB, Sport PASM and Front Axle Lift ( I have needed this as it's quite low at the front) in fact it's effectively a Turbo S spec without that car's 3.8 engine and cost a lot less. Compared to the previous 991.1 GTS it is just so much quicker to accelerate without having to work very hard and despite what some may say, IMHO it sounds just as good with or without the PSE switched on. I have driven it over 160 mph in Germany, touring in Switzerland and France and some spirited drives around Wales and Scotland, frankly it's a terrific all round car, can carry two of us with luggage for a 12 day holiday and it also takes a full set of golf clubs with a folding electric golf trolley. It delivers fantastic performance and a range of over 400 miles without really trying. I have driven it through the winter months up to the point of snow after which my Macan with Winter Tyres takes over but the PTM (4WD) really does the job on wet greasy roads.
You should go for an extended test drive by which I mean a few days and see what you think, I'm sure you can find an OPC that will do that.