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It depends on whether you want to race purely against other Porsches or against a mix of cars.
Porsche Cup have, I believe, more support from Porsche and Michelin (or Pirelli?? I know a media release came out the other day about this but can't recall which one it is now) and is officially supported by Porsche whereas Nations Cup has little or no factory support and is run by ProCar, not Porsche
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