Auto lokcer -vs. selectable, there's one big bonus for both on-road and off-road use: you can decide exactly when to keep the lockers on or off. For road use locker's aren't needed much at all (severe winter weather may require that, but that's about it), and on the trails you do not want an auto locker when driving a slippery sideways-inclined road. You will end up sideway and/or in a ditch
Auto lockers are cheaper, lunchbox lockers are very easy and cheap to install, and even a Detroit locker/ truqtrack costs about 30-50% less than selectable lockers. ARB needs a compressor, OX needs to cable actuator system, and they both cost quite a lot. Eaton E-locker is electric (very similar to what TJ and JK Wrangler Rubicons use), wires/ switches/ relays are all included.
I've had both an ARB front locker and now I've got an Eaton e-locker - would never get an ARB after running the e-locker :thumbsup:
No need for an air compressor, no problems with locker engagement in cold weather, no air leaks. Eaton sure needs the two wires for the locker as well which can snap, but IMHO it's a far better choise and easier trail fix would they snap. Smoother engament too. Overall cost is cheaper.
Some people have had problems with the locking mechanism breaking in the Eatons, but ARBs do that as well (not as common though). Avoiding full/ part throttle locker engagement should help in keeping the locker good.