The GTS is pretty much best of both worlds.
The GT4 is a very hard ride and as is focused more toward track, now way I would want to tour for a few ks. The GTS has all the best bits of the 718 same engine 20hp less, more discrete on the road and as Henry Catchpole said in his review on the same twisty a/b road the GTS is 9/10s but is the better car.
The interesting thing is pricing atm there is a 718 Cayman GTS for sale for £77,500 the 718 GT4 is a very slight evolution on the 981 GT4 but they are available from about £62k and the 718 GT4 £84k 718 Spyder 85k.
The Spyder is gorgeous but that roof is just a faf, with experience touring Europe when you get a rain storm rolling through you want that roof up asap, the spyder is inconvenient. For me the Boxster GTS would be the one I would pick.
Tough choice, GT4 would be end game for me but the GTS is the car to have to enjoy everywhere and on the road many reviewers have said its 9/10s the car but the better car for actual road use where it will spend well for me 100% of its time.
These 70+k cars I wouldn't want to ruin it on a track, you can have far more fun with a much cheaper car without the worry of binning it.
Plus maintenance... the GT3 ceramics rotors are like £9k to replace on the front... absolute madness not sure if they use the same on the GT4 and from reading up on the forum people are getting like 30k and needing to swap. Porsche say they should last forever but.... evidently not.
Porsche then came out and said ceramic brakes shouldn't be used for track use
because people were wearing them out in no time.
https://www.carscoops.com/2019/03/warning-porsches-8-5k-carbon-ceramic-brakes-arent-meant-for-track-use/
The cup tyres also come with 4.8mm and need replacing at 3mm... literally a weekend track session.
Those GTS you can order from the dealer too... not the bullshit if you have bought 10 other Porsches this year we will give you allocation.
Caerdydd
North West Surrey