The easy, safe bet answer right now is probably that the PSA 7 is more desirable across the masses.
I would tend to agree that 71's don't look fantastic in SGC slabs with the black on black, though I've owned some. For me personally I'd pick the card that I thought looked the best, regardless of which slab it was in - assuming the prices were fair / comparable.
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Postwar stars & HOF'ers. Cubs of all eras. Currently working on 1956, '63 and '72 Topps complete sets.
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