I own cards from both companies but much more heavily weighted with PSA. As far as high end post war cards PSA will consistently fetch more money. Their set registry was the best thing that ever happened to that company. If you just do a basic search on ebay PSA to SGC you can see their market dominance. I know the board favors SGC but PSA dominates in pure volume.
I was very surprised a month ago as I had 7 1952 Bowman Stan Musials graded, 6 by PSA and 1 by SGC. I received 3 PSA 5's ad 3 PSA 6's and the SGC was a 60-equal to a PSA 5. The SGC 60 outperformed all 3 PSA 5's on ebay by a nice margin, so you never know. All 4 cards sold under the PSA SMR-the 3 PSA 5's well under the guide. Maybe post war mid grade cards do just as well if not better in an SGC holder. I will try more just to see if it is not an isolated case.
On a side note, I ended up with 3 WIWAG cards in my collection some years back and PSA made good on all 3, although I had a 1969 PSA 8 Mantle and a 1960 PSA 8 Mantle that I could have sworn were both WIWAG and PSA said they were just weak for the grade. I disagreed and always wondered about those two because they were a bit more expensive. I also sent a 1934 PSA 6 Batter up Lazzeri for a bump attempt and PSA told me the card was trimmed and should have never been holdered. They paid me fulll SMR which was more than I paid for the card. One other incident, they lost a 1954 Bowman Ted Williams on a submission and paid me my full declared value for the card even though they never saw it, it was a very nice card that was declared at $2,500 if I remember correctly. I thought it would grade a PSA 6 or a PSA 7. It was a 1 card invoice submitted with other large bulk invoices that accidently most have been misplaced and never found. They were extremely troubled by the incident and gave me no problems. I have graded with them for over 15 years and that was the only card they ever lost, but it was taken care of swiftly and professionally.
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