Welcome to the zoo Joker. I think I saw these questions under General Discussion I think. Did you get answers to the compatibility questions? Both of these two look to be in good shape. Any frame rust on either one? I'd spend my money on the one that was in the best shape and personally I prefer the looks of the silver one, more of your basic Trooper. Is the 96 a manual or an auto? If it is a manual tranny that would definitely be my choice.
Post up some pictures of whichever one you decide to build under Member Rides so we can all follow what your progress.
Willie's 1990 Trooper LS, 2.8L
The Duck Marsh Debutante
Willie's 1987 Trooper LS, 2.3L