A torsen diff up front could create some unwanted handling on icy roads. An electric-locking diff would be best. The PCM could unlock it if there is an ABS event, too much steering input or too much input torque, as a component saving device. Electric-lockers are much better than ABS traction control systems in off-road style terrains, but ABS based systems are general public friendly.Z71 Trucks should have an optional Torsen front differential or even a locking one too. I mean, unless they put forth the All Terrain HD, then that'd be okay.
For 90% of the public Z71 is about status, for 9% it is the additional protection and capability. The remaining 1% is upgrading the truck with aftermarket support.