Well, in my opinion, and you'll get plenty more I am sure.... I'd go with a Detroit locker in the rear only. The reason I say this, is because without a locker and the way these trucks don't flex, inevitibly, everytime I am off road I tend to drive up on to something and lift one of the rear wheels in the process. Then I am stuck. I always feel a little silly when I have such a capable truck that has no more forward momentum. Then its stacking rocks or hi-lifting off of something.

I don't think tire wear will be much of an issue unless you plan on daily driving it, and honestly as heavy as these things are, most I've ridden in or driven with lockers, even a Detroit, are fairly seamless.

Now all that aside, I'd personally stay away from selectable. Just personal opinion, but ARB's always seem to be broken, or need some kind of attention, and usually just when you need them most. I don't really have any personal experience with Eaton electric stuff, but again, my mantra is keep it simple.