The difference is fairly academic really. I think it boils down mainly to the aircraft being slightly more sensitive in roll - other than that it's fairly transparent.
Dozy, you continue to astound me with your blithe statements on subjects you have little practical knowledge of. That "academic" difference just might have been the difference between AF447 making in into the barn that day and taking that big swim. That sensitivity difference permitted initiation of a roll PIO from what I can see.