Vendor pricing sets an expectation that the more you pay, the better the part. My expectation would be the more expensive item should be better stamped, fit better and be of heavier gauge than the cheaper one. That may or may not apply here.
But for the 'best' price, I'd strongly suggest you'd be better off looking for nice used GM originals; you know they'll fit as good as they did on original cars, and you'll be keeping your car GM as far as possible.