I don't know about snow driving, from austin - haha. I'd get underneath and decide first on Rust. That's a major deal killer to a central Texan.

But reading the other posts above, I'd say either is OK. But think of it this way, the rear locker is meant to force both rear tires to be locked to each other, even if one is not grabbing the energy is going to the wheel with traction, where as the center diff is meant to force both front and rear axles to turn together yet each axle's right/left wheels are not locked to each other, so one can still slip relative to the other.

I'm partial to 01-02 limiteds cuz of their extras...see the above Buyer's Guide links for lots and lots of details....Luck deciding....