Just based on some long ago memories, here are some observations:
Generally, Donruss cards were thinner than Topps, especially the first issue in 1981. I don't think they could even stand up straight by themselves.
Early Upper Deck cards are also thin.
Score cards from 1988 and 1989 seemed thicker than average.
Topps traded/update seemed a bit thicker (at least in the 1980s) when the card stock was different than the regular issue.
I've recently been putting together a 1957 T baseball set, and those cards are very thick.
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Working Sets:
Baseball-
T206 SLers - Virginia League (-2)
1952 Topps - low numbers (-1)
1954 Bowman (-5)
1964 Topps Giants auto'd (-2)
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