we use the Cooper ST and TTs at work and the guys love 'em. They are on trucks that spend the majority of their time off road on fire roads, and carrying relatively heavy loads such as fire pumpers and such. They are relatively quiet on pavement and seem to wear quite well. The Cooper TTs will be the ones I will go with as soon as I wear out the stock tires.
Unfortunately I do not have any experience with the DC, but they do have a great reputation.
I think it will come down to cost. Pick the one that looks best to you and won't tear the heart out of our wallet. You can't go wrong with either tire.
Good luck and post some pics once you get 'em mounted.
