Well, for many of those cards, they're not worth grading by either company.
PSA has a new tool called "Auction Prices Realized" for free on their website that lets you see how sales of PSA cards on eBay and auctionhouses have been. Generally better conditioned cards are worth more in PSA slabs than SGC, unless you're talking about Pre-WWI, and then they're closer.
My general recommendation is to grade cards that will be worth $20 more after grading. Since it's a $7/card fee to grade with PSA now (under their bulk $99 and under specials), you're wasting money on grading if your ROI doesn't approach that number. Most commons in EX-MT or worse or even stars in VG-EX or worse aren't worth grading, and are better to sell raw or in sets.
SGC cards are a little cheaper to bulk grade, but without a useful set registry, they'll continue to lack value on the resale market. Now if PSA ever runs a $5.50 a card special again, it would be better to take advantage of that.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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