The Rome Agent is obviously the better performer, All Mountain wise. That's not to say that the Rome Graft can't hold it's own outside of the park, because it was actually designed to handle well in and out of the park, and is often used in the backcountry by both pro's and weekend warriors. If you want something softer, then the Graft is definitely your board. The Graft feels pretty indestructable lol. Really fun board (I have the 07 one).
I'm actually considering buying the 08 Graft-if I can get one pre-season-and giving my 07 to my brother. Put some 390's on there, and you've got one really enjoyabe setup. I'm sure you'll love the Graft just as much..