Out of both the Nitto Trail Grappler supplies superior dry grip, whereas the Cooper STT Pro is better with wet and snow traction. And besides, that you can't really tell which tire is better as it gets complicated with other performance sections.
Both mud terrain tires offer premium options for your heavy duty trucks, though still out of them, there are a few areas, where we saw one tire performing better than the other. The BF Goodrich KM3 provides one of the best traction when it comes to sand, and other than that, the tire does great on mud as well comparatively. It's winter traction is also superior, and so is it's fuel efficiency and comfort capability. In comparison the Toyo Open Country M/T offers better dry grip, tread life, and rocky terrain traction.
Out of both tires, the Nitto Trail Grappler takes the lead when it comes to dry handling and rocky terrain traction, and on other off-road areas, its almost on par with its competitor. The Pro Comp M/T2 on the other side, is very surprising when it comes to tread wear, as the tire produces minimal rolling resistance, and with yields better fuel economy. Moreover, you also get to see better snow traction and wet road performance on this tire.
On Cooper STT Pro, you are going to see better rocky and sandy terrain traction off-road, and on pavements, a better grip, but only on dry. The Yokohama M/T on the other hand, provides better all season traction, so it's not only better in wet, but also in snow. And off road, although it lacks on rocks and sandy dunes, it's mud traciton is on par with its competitor.
Out of both tires, the Cooper Discoverer STT Pro simply shines on rocks, that's why I rated this tire for it in my list of top mud tires. Moreover, the tire is also great with muddy terrains, and on smooth roads, its gets to provide better tread life and fuel economy. Federal Couragia M/T on the other side, provides superior mud evacuation and off road performance, but the tire could really use some help on smooth pavements.
The General Grabber X3 being a heavier and stiffer although lacks slightly in overall steering response, it still offers better tread life, fuel economy, durability, and wet traction. On the other side, the BFG KM3 provides you with superior wet and snow traction, better overall comfort (bumps absorption), and great mud/dirt evacuation capabilities. Moreover off road, although both tires are on par in almost all sections, the KM3's resembles to paddle tires allows it do much better on sandy terrains.
Out of both tires, the Cooper Discoverer STT Pro provides superior traction on rocks, and better mud and sand performance as well. Whereas the Wrangler M/TR is better off for dry and wet roads, and it's compound is a better seasonal tire as well, that's why you get extra winter traction with it as well.
Out of both tires, the Pro Comp Xtreme MT2 takes the lead in traction on wet roads with its' flexible tread, which also gets to provide ample snow traction. Moreover, the tire also does great when it comes to fuel efficiency and for tread life, its one of the top performers (in M/T tires). The Toyo M/T on the other side, provides better rock climbing, a more durable structure, and superior mud clearing and hydroplaning resistance.
Maxxis Razr M/T being a heavier and stiffer tire lacks in overall steering response, fuel economy, and wet traction. Though it's better when it comes to rocky terrains, deals better with noise, and gives you a longer tread life. On the other side, the BF Goodrich KM3 provides you with superior wet and snow traction, better overall comfort (bumps absorption), and great mud/dirt evacuation capabilities. It's resemblance to paddle tires also make it one of the best ones out there for sandy terrains.
Both tires are very different. We have a more aggressive tire at one hand, the Wrangler Duratrac, which is more capable of doing off-road crawling with it's thicker shoulders and prominent tread voids which chew on all kinds of surfaces. And on the other corner, we have General Grabber A/TX which basically provides better traction on smooth surfaces, though it's highlighting feature includes effective resistance to tread wear and snow performance.
Yokohama Geolandar X-A/T G016 being a rugged terrain tire is a more aggressive option, so its not surprising why it performs better on mud, gravel, rocks, almost all of the tougher terrains. Though you can say, Geolandar A/T is pretty good in sand comparatively. And it's on performance is obviously superior, though it's best known for it's wet traction, as its dry performance is lacking (compared to other all-terrain tires, see all of them here).
Both tires offer really amazing all-season traction, where both offer equal winter traction, earning 3 peak mountain snowflake rating. Though off road, the BF Goodrich KO2 takes a larger piece of the pie, as it's powerful construction of 3 ply sidewalls can bear more challenging terrains, and its interconnected grooves grip in all directions. The Destination X/T on the other hand, provides better on road grip, where its wet traction is slightly better (though not so great overall, when compared to other A/T tires).