Tough call, if looking at just the four denominations of each set ($1, $5, $25, $100).
I've never been a big fan of the 1989 Dunes golf inlay (or any of the dozens of knockoff variants), and most of the nicest chips in that set are the higher denominations ($500+). The mold is outstanding, but the colors/spots on the 1-100 chips are just sorta average, nothing spectacular (the $100 is easily the best of the four). Shaped inlays on the $5 and higher denominations, plus a spotted $1 are pluses.
The 1972 Tropicana set always felt weird to me -- it was one of the very first made by Paulson, and it just feels different than their later products. The mold is just okay, and the colors/spots are nothing special, except for the excellent $100. Shaped inlays on the $25 and $100, with a great classic inlay design, although the denominations are not particularly easy to read. I much prefer both the 1968 TRK scrown and 1979 hot-stamped THC sets over this one.
For me, if wanting a four-denomination old-school Vegas cash set, I would unload both of these and get something better. I sold both of mine.