If you need chains, then get chains. But a decent pair of snow tires will get you by on the highway. Studs if you live in an area where you're going to see months of snow and ice.
A year or more ago, I was looking into a set of chains "just in case".
1. The diamond pattern for chains is what you're going to look for. This is helps provide for better traction and is easier to install.
2. Look for chains you can easily put on while in deep snow, so avoid the kinds you have to lay on the ground and drive forward. You may not be able to do so. Cables are out, diamond pattern again.
3. The size of the links helps determine how long they're apt to last. Since it may not be easy to tell who uses 4mm versus 6mm links, weighing the chains can help. 20 pounds versus 13.5 is the tell here.
Personally, because I don't find myself wheeling in the snow, a set of RUD grip chains wasn't necessary (~$100 a pair). So I opted for a smaller (in terms of links, not size) set of Peerless Autotrac chains (~$50 a pair at Walmart) for those "just in case" situations.
Plus the peerless Autotrac chains have a self tightener. If I'm in a pickle and *have* to chain up, stopping to check and readjust the chains is probably not in the game book.