I have both a 2 post and 4 post. For working on vehicles, 2 post is the way to go. My four post also has a sliding floor jack in the rails for jacking up vehicles while on the lift to remove wheels. This is fine if your main objective is storage, but want to do some work. If you mainly want to work on vehicles, get the 2 post.
i have the Challenger Versymmetric. Purchased from Best Buy Automotive in Temecula.