From an investment perspective the more valuable version (PSA 9 vs. PSA 10 vs. BG 10-black) today will typically be the more valuable version down the road (assuming appreciation overall) and the gap between them value wise will only grow over time IF the card appreciates. Consider this theoretical example:

PSA 10 vs PSA 9 - Where is the Value? - Investment or PC? | Sports Cards Collecting and Investing | Josh Unboxed 4.36K subscribers Subscribe 4.3K views 2 years ago #sportscards
PSA should drop to zero after surgical removal of the prostate, and to near zero after radiation therapy. Prostate cancer cells release PSA, so if the levels rise again after this initial treatment, then new tumors are likely forming in the body. This is called a biochemical recurrence, because the newly developing tumors are still too small to Luka Nation is a community of sports card collectors and enthusiasts. We're a series of YouTube shows dedicated to sharing our hobby collecting journey with
Depends on the card. An example is a base panini prizm Zion PSA 10 is selling around $500 and a base Zion PSA 9 is selling around $160
Then you look at the Grading Standards for a 9 and it says centering can be 60/40. So it does seem strange that the 9 can be worth 10 to 20% of the value of the 10. From that angle there could be zero difference at all between a 9 and a 10.
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    • psa 9 vs psa 10 value