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FYSThe fact of the matter is that all three companies will make mistakes. There are variations because of different graders and different individual company policies. A newer grader may reject a large percentage of cards, because their comfort level is not there and they would rather error on the side of caution. You could also say the reverse and the new person lets too many trimmed versions go by. Someone noted reasonable doubt, I am sure all companies have this subjective grading outline. This will change with every person and every company. Even the same person can change year to year. So there will be variability.
The real question is: Who makes the least amount of mistakes and who will guarantee to pay you back when they do make a mistake? There is only one answer to that question fellow collectors. So the choice is relatively easy, but sunk and switching costs prevent many from making logical choices. I am confortable spending the money because SGC will make less mistakes than me and they will give me my money back if there is an error.