Good info on the Performance Unlimited site! Of course they are selling the 9" 
Look at the pinion comparisons. See where the 9" pinion necks down? From what I have seen in the field, every shaft, be it pinion, axle, whatever, that necks down like that is prone to break at that point. I've done it several times myself! You asked in your original post for opinions. You even stated "i also know the D60 is a little stronger stock than the 9"". Many gave their reasons why they would go with the 9". I gave my reasons why I like the D60. In the end YOU have to make the call. Harley/dinette set, Harley/dinette set Really, you'll have a FINE axle under your rig whichever of the two you choose!
