I can't speak for all lifts and certainly don't have the experience to vouch for what is best in many situations. But, I can vouch for the lift I have and why. I am running a 4" Rough Country lift. I got the one with front and rear springs. My reasoning was that (1) I don't like blocks, (2) I had significant sag in my factory rear springs so they needed replacing, (3) the Rough Country lift came complete with shocks and steering arm for only $459, and (4) many people on this site recommended them.
The Rough Country lift was nice because it was complete and a staright bolt on, I needed no additional brackets, adapters, modifications, or other parts. It was economical. And the company provided good customer service.
My .02
85 GMC Jimmy <a target="_blank" href=http://tx85gmcguy.alloffroad.com>tx85gmcguy.alloffroad.com</a>