As far strength goes I think the conclusion is the HO72 is stronger than the 14 bolt. But the 14 bolt wins in the aftermarket support and availability, plus they are cheap. Also the 14 bolt doesn't really show it's weakness till you get on 42+ and high horsepower. As far as stronger axle or comparable, the Dana 70 is about equal, a Dana 80 would be the next step as far as axles in factory form.
86 4Runner "The Turtle" - 22RE 5spd, duals, Dana 60, 14 Bolt SAS on jackstands
02 Tacoma - 3.4 5spd TRD