I use all three, but more of my cards are in PSA. As mentioned above, all three are accurate in determining authenticity of cards and alterations, so I have 100% confidence in purchasing my cards from any of these 3 TPG's. All of them can make mistakes in the number grade, so as always, you still need to evaluate the card in the holder when you buy and not only rely on the flip. Since I sell cards on ebay and tend to submit in bulk (often 50-100+ cards), I go w/ PSA since it tends to be slightly cheaper w/ them even w/ their rigid requirements that each card size (regular, postcard, etc) and service level be a separate submission each w/ their own return shipping charges. In terms of the holders, my opinion is that for standard size, I like SGC the best (best looking), with BVG next (sturdiest holder), and PSA worst (too thin). For postcard size, I like PSA better than SGC. The holders just seem to be sturdier to me, and I like the 5x7 PSA holders much better than SGC's. For the larger 6x9 holder, I like BVG slightly better than SGC since it's sturdier although too thick in my opinion. For 8x10 holders, BVG is the only game in town, which is fine. Again, I like their holders, but a little too thick for my tastes. For pins, I think only PSA slabs those. PSA does have a pretty big flaw in many of their holders in that the card can "float" in the holder if it's not a standard size. This can cause corner dings if the card is high grade, which is dumb. Some say that the SGC inserts can "bite" into the card, which I've seen once, but I think is pretty rare. BVG has neither the "float" or "bite" issue, so in a way, you can say it's the best here. In addition, BVG has the ability to holder many cards that both PSA and SGC find are too fragile for their holders. I've used this numerous times. In summary, I think there's a place for all three TPG's, and I hope they all stay around for a while.
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