I've only sent in 15 or 20 cards for grading, all to PSA, because I got a Christmas present of a membership 10 years ago, and used my free subs.
If I ever decide to sell my collection, I'd send the post war Hall of Famers to PSA that are higher grade, just because of the registry so they get a higher price.
I don't know what company I'd use for the pre war cards.
My guess is that they all do about the same job, accurate 98% of the time, with slightly varying standards regarding centering, paper loss, etc...
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