Now we get can into the back and forth about engineering, materials etc., and none of us will get the definitive answer. We've got tons of axle discussions and they have never given the definitive answer. The fact is there is a difference and if you have followed these threads you will see that it comes down to your budget, your belief in using a replacement from the original manufacturer or a competitive manufacturer. Factor in the competition factor and you will find a variance.
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700