Surprisingly, no stats have been posted yet. Oh wait, this is Spurstalk...never mind.
Career regular season:
Ginobili: 14.0/4.0/3.7 on 45% shooting
Parker: 16.6/5.9/2.9 on 49% shooting
Career playoffs:
Ginobili: 14.7/3.9/4.2 on 43% shooting
Parker: 18.2/5.2/3.0 on 46% shooting
Best individual season:
Ginobili: 19.5/4.8/4.5 on 46% shooting
Parker: 22.0/6.9/3.1 on 51% shooting
Best 5 year regular season window:
Ginobili: 16.8/4.2/4.1 on 46% shooting
Parker: 18.9/6.0/3.3 on 51% shooting
Best individual playoff run:
Ginobili: 20.8/5.8/4.2 on 51% shooting
Parker: 28.6/6.8/4.2 on 55% shooting
Best 5 year playoff window:
Ginobili: 18.0/4.0/4.4 on 43% shooting
Parker: 21.3/5.5/3.6 on 49% shooting
Best individual playoff series:
Ginobili: 22.2/4.8/6.2 on 49% shooting (not even the best player on the team in that series)
Parker: 29.6/7.0/3.4 on 52% shooting
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I guess in the theoretical world that never actually happened Ginobili was more dangerous offensively though.