why not more cantilver setups?

why dont more people use cantilever and the "hybrid"or the hydro over bags setup? i see more people with the cantilver set up and it is really making me want to try it out on my truck. but with the other system (which i not even sure what its called) not to much. is there a reason for this?

i have almost all the stuff to put that kind of a sytem together and was thinking it might not be a bad idea to put it on a prelude that my wife has. i wanted to because it would be easier to get lower/higher with the cylinders. is it an efficient setup up to use on a car?