Gear whine is all about the installation, not the hardware. I have Motive 3.90s -- have had em in for 2 years and they don't whine. I've heard Ford gears that whined as well as Motives and other brands. Just make sure you hire a good, EXPERIENCED installer.
There used to be no real difference between Motive 3.90s and FRPP (Ford) 4.10s -- in fact Motive MADE the gears for Ford. I've heard that within the last year or so, Ford slightly changed the design on the gears so that the FRPP gears are slightly easier to set right on install and Motive no longer makes them for Ford.
Just food for thought -- Motive is still a very good brand.