The PSA registry is extremely nice, which most people on this board are probably aware. You can add many cards to your inventory, and it will let you know all of the different registries that you can have. PSA validates that only one cert belongs to one user, so that if a card is sold, you won't have the same card in registries for different users. Of course, one of the biggest things is size. It's like ebay which people hate. If you want to compete for best sets, you want to go to the place with the most competition. It's a lot better to say that you're #3 out of 30 sets that #2 out of 4 sets.
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