Generally I think SGC is a bit tougher especially since tightening their criteria on centering but one could find exceptions from both. All the cards from both sides are graded by humans. That said, PSA is so tough on crossovers it seems like they just reject crossovers most of the time on general principal. I have not gotten than impression from SGC.
In terms of re-sale value today I think a blanket claim of PSA for post-war and SGC for pre-war is a bit simplistic.
JimB
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