Base - road tires, no locker, no luxury, just basic 4wd vehicle
Big Bend - same as base but some aesthetic upgrades
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Black Diamond has the basics you need to off road (A/T tires, skid plates, rock rails, locker).
Outer Banks is that + interior luxury (like a Sahara)
Wildtrak is very desert racing specific (35" tires, upgraded suspension, different gear ratios). i can't imagine you'll see many of these.
Badlands is the most off road capable. basically a Rubicon (Black Diamond + 33" tires, disconnecting front sway bar, etc)
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First Edition - this is just a collector item that will be $60k+, only 3500 will be made.