Definitely a lower CG. The doors weigh a ton as well. Then there is the piece of mind that you won't break the top or doors. You can even knock out the pins for the windshield hinges and replace them with bolts. Then you can take the windshield off as well. Although then you won't have the spreader bars but reall those cage in pretty easily.
Forgot to mention, your rear suspension will probably rise 1-1.5" with the top off as well.