mike...I don't think your question can be answered...as has been displayed...it's not that cut and dry! I have seen instances of both SGC and PSA misgrading cards...and I can't see any pattern...or rhyme or reason to certain sets...or types of cards this occurs with!
I HAVE seen many more errors from PSA...but this is most likely due to the fact that they have graded so many more cards than SGC.
Personally...I trust SGC much much more than PSA when it comes to accurate...consistent grading of my vintage cards...but as stated...they both make mistakes...and if you don't like the decision...resubmit!
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