I can tell you my experience with a few lockers.
If I were just doing occasional off-road stuff, a lunchbox locker in the rear only would be my personal choice. It all depends on the terrain too. Lockers are wonderful in rocks and technical stuff, but limited in snow and mud.
I've used spools and ratchet type lockers, and even welded a few diffs and they all have their place, but realistically, for something being driven on blacktop a lot, to me nothing beats a locker that allows some slippage around corners. Especially so in snow or in the wet. A good locker will make a huge difference in where you can go, particularly in an inflexible frame vehicle like the 715. I can be stopped by even the slightest lift of one rear wheel in my stock diffs. I have tried limited slips, but they aren't the same, and still tend to act like an open diff in some situations.
Unless I plan on doing almost exclusively off-roading, I wouldn't use a front locker on the street, but that is just my opinion. Disconnecting hubs are a must with a front locker. That said, if you do a lot of off-road driving, there's nothing like being able to get a leg-up with a locked front end over a ledge or big rock.
Again not the gospel, just my .02
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