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boxingcardmanOne thing that is apparent from doing business with both is that the grading arts at PSA and SGC are different in certain respects, primarily having to do with the primacy of centering versus sharpness and corners. IMO PSA emphasizes centering more than SGC and SGC emphasizes sharpness and corners more than PSA. Overall I happen to prefer SGC's approach to grading so the vast majority of my business will go there but I understand PSA's as well.
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