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PCI've purchased hundreds of low to mid grade T206 commons in the last 6 months graded by SGC, PSA and GAI. GAI examples typically sell for less than SGC and PSA, and when I have the choice, I go with SGC over PSA, and PSA over GAI.
In grades of 1 and 2, the price differential between SGC and GAI for any individual card is not that great. But if you have 200 cards, then a few bucks more per card begins to make a difference.
Of course, it also depends on the grading deal you get betwen SGC and GAI. If SGC costs more than four or five bucks more per card to grade than GAI, then GAI may be the way to go. If the costs are about the same between the two, then I would, personally, go with SGC.
Good luck.