I like all the big old American lockbacks.But by far the best and strongest inside out is the Buck.Closer tolerances,blade bushing,cleaner grind lines are a few of the reasons.The old Rigid USA from the 80's were very good.They even had a bushing for the rocker pin.They sell on fleabay for around 200 now.The Case Shark tooth is the best of the 3 in that series,but not as good as a plain ole 110 IMO.I like the LB-7 and the LB-5,but they often have blade wobble and little to no closing spring.I sure wish Schrade usa could have hung on though.