I had 2 sets of Duratracs both very good but they did get a little loud as they get near or above 40K. I have been running the KO2s for just over a year and so far I really like them. KO2s do give up a little bit of off road deep snow bite but they are great in all other situations. I would say that so far for daily year round use the KO2 is a better tire but they are very close. I really feel you won't go wrong with ether the Duratarc or the KO2.