I think all the brands/series/etc. from ranks #12-18 or so are really close. One can't draw accurate, far-reaching conclusions based on data from the past year or two years imho. Current prices do not necessarily reflect relative scarcity. It only takes a few people battling it our for something at the same time to skew the numbers on the short term.
Just looking at the first two spots on your list, I would say that Piedmont factory 42 is much tougher than Hindu. When I decided to go for all 39 backs instead of just the 16 brands last year I went through my raw set accumulated over the past 31 years. Actually it was about 600 T206s, a bit more than one set. Out of 600 I had NO Piedmont fact. 42s, but I had probably 8 or 9 Hindus. These cards were all accumulated when nobody even knew or talked about factory 42 being tough. Just one person's experience.
JimB
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