Not really even an arguement to make, open is useless on anything, I can get tire spin from the automatic tranny 4cyl ranger pickup we have at work with anything other than dry pavement.
Factory clutch type traction locks need rebuilding every now and then depending on use, if you want to avoid that go with something like the powertrax no slip, you hardly know its there but it doesnt have any parts to wear out so it always will work for you.
Car craft loved theirs, until they blew it up with drag slicks and racing. I think that was more due to flex in the rear end though, if you axles start hula dancing itll rip a locker apart real fast.
looks like u have a 91, probably with an 8.8, you could get a traction lock carrier from the junkyard and have it rebuilt and put in you rear end if its an open one for some odd reason. a f150 preload spring will make the tires lock up a little faster too.