First all, do you plan on taking the Jeep offroad? The main difference between the two, well is many. The Rubicon is the "off roader package". It includes lockers, sway bar disconnects, dana 44 axles, a 4:1 transfer case, 32 inch mud terrain tires, among other things. The Sahara is the more "street version". It has body colored fender flares, optional color matched hard top, etc. It really depends on what you plan on doing with the Jeep. Price wise depending on how you option them they can be around the same price. So really what you depend on doing with it will help you decide which model. Im sure more will chime in on this....