I have 2 friends that run the Hankook M/Ts on their Jeeps. Bot told me they will not be getting them again. One of them ran Maxxis Bighorns (like I have) before the Hankooks and said the Bighorns did much better in the snow and about the same in mud - mainly because the Hankooks have no siping and that makes a big difference in snow/ice. The other friend had Cooper STTs before his Hankooks and said they blew the Kooks away in the snow (which I believe since I saw him struggling to get up our access road several times last winter with the Kooks, but he never had problems in the previous years with the Coopers).
If you're looking for a real snow tire, the only choices you have IMO are Goodyear Duratracs or Dunlop Maxx Traction M/Ts. I had the Dunlops most of last winter and they were the next best thing to having chains on. The tread pattern and irregular cuts on the lugs make it hard to slip sideways. I even I pulled the ebrake and tried to make it slide out and it would hardly move. Both of these tires have the severe winter service rating (with the mtn. and snowflake symbol).