Gerobi AC is just really good when baited a melee.
OO Qan Full Saber-High movement that allow me to get in close and personal for a short but sweet guarantee 190+ damage. In OO Raiser mode CSA gerobi gives me a lot of way to fast fall and catches Baels trying to rush me.
OO Gundam-Relatively easy to play, have basic attacks but effective especially shotgun CSA. I have quite a few favorite suits that I can give reason to why too.