2018 GTS - is it a CPO car? It's 4 years old...Panoramic sunroof
Heated front seats with memory
Heated steering wheel
Lane change assist
Wheel center caps with colored Porsche crest
IMHO, any 2018 GTS will drive better than your 2020 S because of PASM and AS, would sound much better because PSE.
Would I swap 2020 S for 2018 GTS - no, I really like the new big screen and CarPlay.
If you really want GTS I'd focus on finding 2020/2021 GTS gen.2 instead.