So overall, we saw here that even though Cooper AT3 is good with directional grip, the overall on-road performance (dry), is seen better on Hankook AT2. Moreover, the tire also does great with tread life, and winter traction. And off-road its great with rocky terrains, with its 3 ply sidewalls. The Cooper AT3 on the other side, does great on wet roads, fuel efficiency and comfort. And off-road its a better tire to have on sand.
So let me conclude all of it here quickly. The Mickey Thompson 38 AT provides superior dry grip, and is great off-road on muddy terrains. Whereas the Cooper AT3 does better with wet grip, comfort, fuel and tread life, and off-road, yields superb sand traction.
Overall it all comes down to this. Cooper Discoverer AT3 4S although gives you a great wet traction, and tread life, it lacks in fuel economy and on-road comfort (in terms of noise). BF Goodrich Trail Terrain on the other side, does well, with the rest, but wet traction, and off-road it's great on all terrains, but lacks in mud, comparatively. Note that this is the short summary, if you are skipping on the above explanation, there's a lot of stuff you are missing out on.
So overall, the Cooper AT3 is a better pick for pavements, roads, and highways, both in wet and dry environments. This is because it provides better traction (grip), steering response, fuel economy and tread life. The General Grabber APT although is good enough on dry, really lacks on wet roads, but it's a better tire for off-road use, in nearly all types of (mild) off-road terrains.
Goodyear Wrangler All-Terrain Adventure is better tire to have for highways. It's yields slightly better grip and handling efficacy in both wet and dry environments. Moreover, the tire is also better with fuel, tread wear and on-road comfort. Cooper AT3 XLT on the other side, does better off-road on all types of terrains, including sand, rocks and even mud, thanks to it's powerful sidewall lugs.
Out of both tires, the Mickey Thompson EXP yields better results when it comes to mud and sand traction, it features longer tread life, and you'd get better comfort on roads as well, here. On the other hand, the Ridge Grappler provides superior rock and snow grip, a quieter ride, and a better fuel economy. Other than this, both tires have similar traction values on both dry and wet roads (well, there's more to it, as I've explained, but for sake of summarizing, it can be said).
Atturo Trail Blade XT with it's less aggressive structure provides better dry and wet pavement performance and the tire is pretty great with fuel, ride comfort and snow performance. On the other side, the Nitto Ridge Grappler features superior off-road traction, on gravel, rocks and muddy tracks. And on-road, you'd be impressed with it's stability, given it's a more aggressive rugged terrain tire.
Cooper Discoverer ST Maxx although is slightly more voided, it's mud traction is on par compared to it's counterpart. Other than that, the tire yields better traction on snow, comfort, and on-roads, its a better tire to have on wet roads (though overall, comapred to other options available, it's not so great). The Nitto Ridge Grappler on the other side, is overall a better tire to have on dry roads, as it's great with traction, noise, fuel and tread economy. And off-road you'd get a better performance on sand and of course rocks, where it shines the most. (I rated this tire for rock traction, in my list of top all-terrain tires).
Comparing both tires, you'd see that the Kanati Trail Hog A/T has better performance when it comes snow traction, and on road comfortability (though don't get me wrong, by comfort, I only mean it offers better cushioning of the bumps, and the tire is pretty loud). On the other side, the Nitto Ridge Grappler does better on roads, but that only goes for dry environments (Trail Hog is better on wet pavements). Other than this, the tire stays unbeatable when it comes to climbing on rocks.
Milestar Patagonia MT is better in dirt, sand, and mud tire, which is not surprising at all, given it's a mud-terrain tires, though it's rocky terrain traction is only marginally better here in comparison. On the other side, the Nitto Ridge does better on pavements, comparatively, it's fuel consumption is better, it provides superior winter traction, ride comfort and traction wise, its great especially when it comes to steering response (both in wet and dry).
So overall, it all comes down to this, the Nitto Trail Grappler being a mud terrain tire is a much better fit when it comes to rugged terrains, including sand, mud and even rocks (though with a close margin, I should add). The Nitto Ridge Grappler on the other side, is a better tire for pavements, it shows superior traction, dry steering response, winter traction and on-road comfort.
Cooper Discoverer STT Pro features a superior traction off-road overall. Surprise, surprise. The tire does best on sand, and mud, though on rocks it's only a little better off the two tires, according to my tests. Nitto Ridge Grappler on the other hand, features a better on road traction and comfort, combined with fuel economy and tread wear.