Speaking as a collector trying to build a centered set, the answer is hands down 1952. Even on the best cards, you'd be lucky to have 20% of the population of a given card with 45/55 centering or better. The worst cards may only have a dozen examples across the entire set run (Eddie Mathews comes to mind).
In my very unscientific opinion, maybe 10% of all 1952 cards printed were well centered. Even when you find centered examples, many of them are diamond cut.
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