I prefer SGC
I do buy PSA. I do not sub to PSA. For me it's not cost efficient.
BVG is not as tight on grading vintage as SGC or PSA I don't think.
BGS is really good on modern, in my opinion.(also will grade modern sheet cuts)
GAI no clue.
CSA no clue.
ISA no clue
GMA no clue.
KSA for hockey, if you don't mind sheet cut, they do pretty well on the hockey grading. In my case I wanted, just for the heck of it, a Scott Stevens KSA 10 RC. Knowing full well it was most likely sheet cut, but also knowing it was for my personal collection only. I knew going in. So no disappointment.
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