As for the Ford vs Chevy outers, there is a disadvantage to the Ford stuff. With Chevy and Dodge outers, you can easily run an off the shelf spicer 35 spline outer shaft, with Ford you either have to go to a custom shaft (big bucks) or pull some other hokey stuff (don't know the details, somebody was talking about it on Pirate one day). As for the dual piston calipers, some say they are harder to fit a 15" wheel over, some say easier, I've never tried. But most people say they stop better.
Pete
'83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
'97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd