The unicorn of the tire world has to be the elusive all-season tire that excels in snow traction. I think it is important to first understand that not even the best all-season tire will come close in winter traction levels to the worst winter tire. They simply can't. They are asked to do too many things in too many temperature levels. However, for many it is simply not practical for a variety of reasons to run two sets of tires on their light trucks or SUVs. To those people I typically recommend the following:
If traction is the goal and one can accept a slight penalty in ride comfort and road noise generation, I would suggest the Bridgestone Dueler A/T Revo 2 or the Michelin LTX A/T 2 (shown below right). Both are extremely technologically advanced tires that offer state-of-the-art tread compounds and designs to take advantage of all the traction the tire has to offer over the entire life of the tire. This is important, as snow and wet traction typically dissipate with age due to the loss of tread depth. Bridgestone uses a dual layer tread compound to expose a focused wet compound as the tire wears, while Michelin employs advanced tread design to maintain siping as the depth of the design goes away. However, all this technology does come at a price. They are both on the premium edge of the pricing scale. Well worth it; however, not for everyone.
If you need a good tire at a good price, consider the Firestone Destination A/T (shown at left). They do not have the technology, however they do behave well in the snow and wet. Since the tire was less to develop, and less expensive to manufacture, they are the best value in an On-/Off-Road All Terrain tire for a truck or SUV in the winter.
If you are not into traction at all costs, but are more interested in wear and comfort, there are still some decent options to get you through the white stuff. I would recommend the Michelin LTX M/S2 (shown right) or a General Grabber HTS, which is a surprising value. Both will be more comfortable, quiet and should wear a bit longer than an All-Terrain tire. Again, Michelin uses state-of-the-art construction and design techniques to get you more wear and wet traction. General doesn't have quite the technology thrown at it, however it still achieves good results and is priced far less.