I think if you decide to go auto locker, the Detroit will at least give you piece of mind since it's a full carrier replacement locker and should be very strong.

Harry covered all the basics. Just keep in mind that highway handling will be quirky and take some getting used too. Not usually a big deal. They are also noisey.

However, if you spend a lot of time in ice and snow driving, you might considering spending the extra dough for the ARB, since it will be safer to have the alternative of open diffs on the highway during those weather conditions.

Another thing to consider is if you plan on going with front/rear lockers, I would save the ARB for the front where it will do the most good and go with the cheaper locker for the rear.

It would be a shame same to have an expensive ARB in the rear then have to go with an cheap lunchbox up front, because you ran out of money. An on/off locker really should be up front, IMO. If you got money to burn, ARB or Toyota electrics front and rear are the ideal set up, IMO. Toyota electrics do require some axle mods, though and aren't available for the front if you have IFS.

good luck.