Ox locker's have a great reputation but I have not personally used one. I have owned several ARB lockers and can attest that they are strong, and I've never encounter any problems beyond an occasional air leak from hoses. My personal choice is to use an ARB for a selectable locker. I intend to use another ARB when I start to build a new rear axle for my TJ.
Lives in garage:
2004 Red Jeep TJ "X", big tires, suspension, stereo delete, dent in cowl.
1982 Red Jeep Scrambler, small block chevy on 35's.
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -Benjamin Franklin