If you just want to keep it upright when you park it only the rear is necessary. If you do not have rear sliders you will have to lift it by the swing arm, which the standard version will have.
The swingarm lifts on the pitbull are why I prefer the GPI. On the pitbull they are round and don't seem very stable to me...pretty much every time I lift my bike with the pitbull it wobbles as I lift it and the arms that go under the swingarm "walk" up the swingarm a few inches, usually settling uneven from each other. The GPI has squared off arms that have not walked up the swing arm on me at all. Not sure if that makes sense, I can snap some pics of what I mean if you want.