It depends on how long you are planning on keeping the car, what you hope any resale value will be etc.
You've mentioned it not being a money thing, which is fine, and if that is the case, for 6 years old, I'd go OPC and keep that dealer history, that, when yours is side by side for sale against an identical car, Im going for yours with an OPC history rather than Joe Bloggs, whose history is scattered. Also, with the lower mileage on yours, I'd argue an OPC history this will hold yours in better much stead in a furtehr 6 years.
Of course, there's also the hassle thing. Mine is going back to an OPC from recent Indy history, as A, Swindon Porsche was a better rate than the indy, B, it was closer and quicker to get to, C, it gets an OPC stamp back in the book for a Major service.
As many have said, some Indys have a reputation greater than some OPCs, but at sale time, Mr Joe Public for his first Porsche, may want OPC history.
HTH but just my two cents
Mark