I suspect the main reason the PSA card sold for significantly more is because it's much better centered, as others have noted.
The PSA cards had 4 times as many views as the SGC card. This could be interpreted as collector bias toward PSA, which many/most of us already acknowledge, especially for post-War cards.
Also, there are collectors who are putting together 1957 Topps sets with all cards graded the same. A mid-grade set collector might well strive for a complete set graded 5-EX. But, I've never heard of a collector striving to complete a set graded 4.5. This could be one reason the PSA card generated more interest and the higher price.
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Seeking very scarce/rare cards for my Sam Rice master collection, e.g., E210 York Caramel Type 2 (upgrade), 1931 W502, W504 (upgrade), W572 sepia, W573, W575-1 E. S. Rice version, 1922 Haffner's Bread, 1922 Keating Candy, 1922 Witmor Candy Type 2 (vertical back), 1926 Sports Co. of Am. with ad & blank backs. Also T216 Kotton "NGO" card of Hugh Jennings. Also 1917 Merchants Bakery & Weil Baking cards of WaJo.
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