The '57 to '64 housings are the best looking, but the weakest. The truck housings have thicker axle tubes. The housings with the long tapered center are stronger than the housings with the smaller rounded center.
The WAR and WAB cases look stronger because they have extra ribs on the front, but they have a very weak pinion pilot bearing boss. Many people try to pass these off as nodular cases, BUT THEY ARE NOT. There are 2 different nodular cases. One has smaller 2 7/8 bearings and gray iron caps. This one is not the strongest. The other one has 3 1/16 bearings and has nodular iron caps. This is the strongest production case that Ford made.
The standard pinion housing has small bearings in the front and back. The Daytona pinion housing has a much larger inner bearing, but requires a special yoke.
The Ford Traction Lock is weak and should not be used in a high powered car with good tires. After market Traction Locks have a stronger steel case.
I guess everybody knows that the 31 spline axles are better than the 28 spline axles.