Both the Duratrac and Exo Grappler are "snowflake/mountain" rated tires. The BFG KO2 is also "snowflake/mountain" rated, but I'm no fan of them. All three should work similar in snow. However, I'd think the Duratrac with its larger void area would clean out much better in the mud. If you're happy with the Duratrac I'd stick with them. Nitto and Toyo are more money than the Goodyears. One other AT/Mud hybrid tire to consider is the Cooper Discoverer STT Maxx.