Agree with the above comments. There are some tendencies of one company to focus on one element (eg corners, centering) vs another (eg paper loss, or surface wrinkles), and there's certainly variation within a particular company's grade. But by and large I find PSA and SGC grades fairly comparable.
Best of luck, and welcome aboard,
--S
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collecting T206, 1940 Play Ball, 1947-66 Exhibits, and 1952 Bowman. e-mails preferred over PM.
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