[4reals]

IMO the resale value differs mostly because of psa's set registries. If your motive in grading is to eventually sell your cards for the HSV (highest resale value) then grade with PSA. If your intention is not to sell but rather to buy, then do what I do and buy BVG which will reward you with just as nice of a card but half the people challenging you for it at auction. As others have said, they are indeed more difficult to crack out of the holder but not impossible, so buying a BVG card, freeing it, and submitting it with PSA is a strategy many use in flipping cards for profit. Another thing I've notice with BVG grading is that they aren't as afraid of issuing half grades and do so more frequently than PSA (can't say for SGC). I also use this to my advantage when buying because the difference from an 8 to a 7.5 in price might be 15-25% yet on many occasions I can't see the difference in quality from one to the next. I will often drop a half grade in my search to save a buck and I'm just as happy. But as the 'ol adage goes, "it's wiser to buy the card than it is to buy the holder".