Originally Posted by
FBinNY
I don't know if the Shimano pattern would fare better or worse, and lack the experience data anyway. On one hand Shimano splines are shallower, but OTOH there are 6 vs. Campy's 4.
Another difference is that Shimano freehub bodies are all steel or Ti so they are much harder than any Al alloy and, therefore, not subject to the same damage. When Shimano made it's brief move to Al freehub bodies (the short-lived Dura Ace 7800 hubs and DA and Ultegra wheel sets) they increased the spline depth significantly and became 10-speed only.
I have a set of 7700 (9-speed era) Dura Ace hubs with 50,000+ miles on the Ti freehub body using mostly 105 loose cog cassettes and there is no spline damage.