I'm basing this solely on your description of where you wheel...I have DuraTracs, and love em. As far as weight, longevity, and all-around traction go, they rock.
HOWEVER...the sidewall is thin, and can get sliced in rocky terrain. I run the 35" E-rated version, so that's not a problem for me. But if your primary wheeling is in rocks, I'd go with the grabbers.
FYI...the GoodYear Fierce Attitudes that BigEZ mentioned are the same as the DuraTracs, essentially, though cheaper. GoodYear owns both.