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Anthony NBoston NL is by far the toughest. St Louis AL lags considerably behind, followed closely by NY AL and then St. Louis NL.
There is a mid tier of scarcity which includes Detroit and a few others, and then a group of easy ones- Phil AL, Cincinnati, etc
Chicago NL is in the mid tier IMO, due in part to a lot of demand for the Cubs. There was a decent SGC 4 that went on ebay last weekend, and they come up a few times a year. I've seen 3 Boston NL's in 5 years of aggressively pursuing this set- the one I have that graded PSA 4, Joe's SGC 4, and one super beater raw one.