It depends. As others have noted, generally speaking the difference in value in % terms for same card tends to narrow the older the card gets. In other words for cards that are 20 years old PSA Resale value might be 30-50% higher. For cards that are 110 years old, PSA might be more like 10% higher. So there are a couple of variables to consider from a math standpoint. How old is the card and how valuable is the card. Think of the ~$70 price difference as your break even. For a $200 card it’s going to be much harder making up that $70 difference using PSA and the older the card is the less chance you will recoup the difference because SGC performs relatively stronger.
So the older the card is and the less valuable it is (don’t grade anything worth less than $200 IMO), the math favors SGC. Most would probably suggest if it’s a $1k+ card you are always better off with PSA if the goal is resale. Although you probably do want to factor in some risk that PSA has a lot of skeletons in the closet.
Also never use SGC for 71 Topps or other black cards. It looks bad.
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