My vote is for a winch,because everybuddy can use a wench once in a while.
Ok,really a winch is a great idea.Nismo had one on his mud truck that plugged right into a reciever hitch(the truck had one each on the front and back)The truck may have been jacked way up and had meaty tires,but it was a one wheel peeler.It was a great idea to have a winch because once your stuck,your stuck.With a locker you can go farther with out winching but once your stuck,your really stuck.I vote ether get both or just get a winch because it will save you so much time getting unstuck.