Personally, for routine use, I prefer TrueTrac in rear, selectable in the front. For 99% of us, 99.99% of the time, this is a nice compromise of ease and serious capability.

But if you like absolute personal control, then a selectable locker in rear as well.
Or if you have do drive on seriously slick ice on a side slope - where even an LSD can cause more side slip than you want. Then a full open (selectable off) can be nice to have.

But I will point out that just a selectable locker in the rear and an open in the front can be a seriously capable rig with a skilled driver! More capable than 99.99% of us need when offroading! That's what I had in my old Pathfinder... I never got stuck.