I have 8411's in my XL, simply because the 8411SA's were not announced until after my BobCat's 40th flight.
Either would be satisfactory. The durability of the gears in not the question; the holding torque and power are the issue, as the BobCat has large ailerons.
Use either one. I don't think that I could tell the difference.

Harley Condra
BVM REP
RAM REP
Buy American!!!!!!