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T206Collector...has been that when I buy graded T206 cards on ebay, the SGC and GAI cards are more consistently graded than the PSA cards. I have come across way too many examples of PSA 5 T206 cards with creases getting slabbed. That has never happened to me with SGC or GAI. I prefer SGC to GAI, however, because of the sturdiness of the SGC holder and the insert, which does not leave room for GAI slippage.
Those of you who collect PSA graded vintage cards are all too aware of the inconsistencies in their grading -- PSA 4's that should've been 5's and PSA 5's that should've been 3's. I know this because I was once a PSA collector, too. I have no such inconsisteny in my SGC collection and that is the reason I stick with SGC.
Unfortunately PSA has an enormous market share, especially in the modern card market. And since there are only so many vintage cards that can actually be slabbed, I hope SGC makes some inroads there as well in order to keep competitive with PSA. If PSA is Coke, then I hope SGC will one day be Pepsi. If PSA is Hertz, then I hope SGC will one day be AVIS.