I've run Duratrac's, STT Pro's, and the Mastercraft Courser MXT (currently on my '08 Super Duty).
I love the Duratrac's but they have a tendency to cup too easily if you forget a tire rotation but are otherwise awesome in the winters we have up here (used them on a company assigned F-150, 2500 Ram 4x4, and a personal F-250 while living in NE OH). They can also get louder than some of the M/T's I've used but the road noise doesn't bother me.
The STT Pro's were never too loud as far as an M/T goes and wore extremely well. I ran them on a Ram 1500 4x4 when I lived in WV with lots of off-road use in all kinds of conditions.
I have been running the Courser MXT's on my '08 6.4L Super Duty SCLB 4x4 for nearly 3 years and just over 20k miles. They're not loud, zero cupping, lots of tread left, and have performed extremely well in the winters up here in Ohio, NWPA, and UPNY.
As for the stock KO2's they're not terrible and are wearing fine thus far with nearly 6k miles in the two months I've owned the truck but I will definitely be looking for something different when they wear out, if not sooner.