Kind of depends on what you want the lift for... For general use, as Roland pointe out, a two post is a probably a whole lot more useful... A four post is great for exhaust work but for suspension work then you'll have to add a cross beam or two and one or two hydruaulic jacks...

Personally, for body work, suspension work, and the other kinds of stuff that I do I prefer the two cylinder mid rise lift...also a good deal for a normal sized low clearance garage....