they're all in the same class of insertable, non-selectable, and all are fairly reliable and effective.
the aussie's have been shown by a few friends of mine to be a bit quieter and smoother overall, but still every so often, click, pop and bang while engaging/disengaging around a turn.
I, personally, need my Cherokee to be un-compromised in any weather by offroad modifications, so that I can hand the keys to my wife, in-laws, etc, without any
hassle. I'm therefore NOT planning on anything but open, LSD, or selectable (ARB,OX,etc).
Its also one of the self-imposed rules of my "super-stock" build. It has to be better than factory both on and off road, and a non-selectable locker simply doesn't drive as well as an open diff, though thats just me sticking to MY plan for MY rig.
Its likely a very good choice for you!
I'd definitely recommend the Aussie.