I havnt used any eaton brands, but I have used the Trac-Lok limited slip and now the Power Tracks Lockright locker (which is basically the same thing as the Detroit E-Z locker).
I would say go with the locker. I am running it right now (todays my first day), and it has proven itself. I hit some concrete obstacles in the city as well as the iced over highway back to cochrane in the flurries as well as plowing through the deep slushy snow on the side of the highway (intentionally

).
But it didnt perform as well as the LS on the ice. and it did have rather rude road manners, but not to the point of frustration.