I had a 2015 carmine red 981 GTS with the alcantara black interior and carmine red stitching. Over time I began to dislike the alcantara because it always had a worn look to it. It wasn't really worn, just the flattening of the "nap" where I sat contrasted to the direction of the nap where there was less contact. When I brushed it a bit, I could get the naps to match, but I was too lazy to do so very often. Another reason I didn't like the alcantara is that it is too grippy. That's a positive if you intend to track the car, but for my 70 year old body, getting out of a Cayman with leather is relatively easy since it is "slippery". The alcantara made the effort just a bit higher. The steering wheel alcantara definitely showed signs of frequent use after about a year including some light staining.
I much prefer Porsche's leather interiors to alcantara (especially the natural leather interiors). OTOH, if someone took some reasonable care of the alcantara interior, I'm sure it would continue to look fine.