I prefer an aggressive guard. If I begin sitting back and trying to "bake" an opponent ( unless I am SEVERELY outweighed) then I feel a bit like I should LET the guy pound on me to get the point across that I should be doing something. I feel like constantly moving from a closed guard, to an open guard, to a butterfly or half butterfly, to a spider, etc... I like them all, but my main objective is to push them away so as to regain my feet, or sweep them. If those don't work within a couple minutes, then I'm looking for the Kimura.