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JKIts not that tougher grading is better. Its more consistent grading that is better. If I buy an sgc card on ebay, I have a high level of confidence that I will know what Im receiving based on the assigned grade. I know that if I buy an sgc 60, it wont have a crease or wrinkle for example. I cant say that with psa - and in fact, have had too many psa 5s fail to cross because of a difficult to detect wrinkle.
Further, I'd rather have a card graded lower, but correct, than a card graded higher and incorrect.