Posted By:
warshawlawI think in general the same card submitted to each service will draw the higgest grade by 1/2 or more from GAI. They're kind of the Russian judges of the grading world, to use an Olympics scoring analogy. So, when I buy cards I look for GAI cards last all other factors being equal and am willing to pay the least for them. I'd also say that although the last few PSA-graded cards I've received have been pretty shoddy for the grade, PSA and SGC are typically within 1/2 grade either way on the average.
One thing I did forget is the "wild card" grade. I rarely receive a what-the-hell-is-that-grade from SGC. The last several times I submitted to PSA I got one or two utterly wrong grades.