I would expect the heavier barrel to be the most accurate. Now, with that said I own both the Tracker II and USH in 20 GA. They have different purposes, the Tracker II is used in very thick cover where a 50 yrd shot will be long and carrying the gun is difficult. The USH is used in open fields where shots may be 150 yds. and I will probably be stand hunting. As for accuracy, the USH with a scope will naturally be more accurate than open sights. Also, the USH has considerably less recoil due to it's weight. My experience is both are as accurate as I am given the sighting choices. JamesIII