TLDR - nice to have another person from Hampshire on the forum though
My 2 cents having had a Gen3 Macan for 18 months before selling it - the S if you can stretch to it will give you a lot more than the 2 which I had for 48hrs previously. The main place you will notice it is not 0-10mph where the T feels sprightly but 15-40mph where suddenly it feels sluggish compared with an S. you can also add the sports exhaust to the T but honestly it doesn’t compare to the stock exhaust sound on the S.
As for seats unless you have major back problems I had 8 way seats and was perfectly comfortable, they are more comfortable and supportive than 90% of cars out there but of course go sit in all types of you can and see what suits you.
Generally as far as gizmos go they are nice but the base car is nice by itself so go for the things you really want/need.
Lastly if there is a choice between Guildford and Portsmouth go for Guildford all day long even if it’s a longer trip!