Why are Bilstiens better:
1) They are high pressure gas shocks, so when they get hot, the oil doesn't foam, and they continue to work. Low pressure shocks will foam, and then the pistons just flop around like they are in air.
2) They are sort of self adjusting. The Patented Bilstien design senses how fast the piston is moving if its moving slow ( smooth road) then is softer, if its moving fast ( rough road) then it firms up for more control. The "adjustable" shocks, would require constant adjustment to match the Bilstiens
3) If you heat up the other shocks a couple of times they no longer work, I've run Bilstiens so hard that I burnt my hand touching them, and they still work fine.
4) the 7100 series is rebuildable. so if you do have problems with it, it can be rebuilt.
5) You only need 1 Bilstien per corner. 1 Bilstien is cheaper than 2 Ranchos , and 1 Bilstein rides way smoother than 2 Ranchos.
Tom