Gears are extremely dependent on the transmission situation.
Up front the locker wont matter because the hubs are going to disconnect it. A Detroit is always a good option but an Aussie, Powertrax/Lockrite will get the job done too.
Out back if you drive it on the street hands down get yourself an ARB or an OX locker so you can turn it off. I drove with a Lockrite in the back of my rig for a long time and hated it. I would have to clutch in halfway around sharp turns to let it unlock, it would unload after I parked and bang, it would unload going down the street. Some will say detroits are much better but Ive had people tell me they do the same **** just not as violently.