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Bottom of the NinthI have not done extensive tests as Kevin has done however I buy huge collections every month, mostly of PSA and SGC graded material. Most cards seem to have been graded recently, and in most cases those are the representations made to me. With that said, SGC's seals are much stronger than PSA's and virtually all of the SGC holders I have broken open, and it is in the hundreds roughly every month, not only have excessive frosting but they end up breaking apart. The PSA holders don't crack like the SGC holders but do frost to a lesser degree than the SGC holders do. My sense is that the SGC holder has a much better seal than the PSA holder.