There are a number of 'lunchbox' lockers that you can choose from. They all have the same ratcheting effect while 'slipping' so just be aware of that effect. Good for traction in some cases, but the full-lock effect in snow on the street can create some surprises. Basically, it always drives the slowest moving wheel out of the differential. Often, they are used in the front with something more 'street friendly' in the rear, since the rear is always in use and you can drive around in 2WD with no downsides to a ratcheting/lunchbox locker in the front. They will not wear your tires any more than an open diff unless you go around spinning your tires all the time.

Locking hubs just disconnects the wheel from the CV axles up front. They don't aid traction in any way. They are needed on 'old-school' axles to keep the front driveline from spinning and reduce wear when driving in 2WD. The ADD system already on your truck does some of that same function in a different way, so they don't get you much unless you want a way to stop the front CVs from spinning while you are in 2WD. Oh, and if you want to get out every time you want to use 4WD if the hubs are unlocked. (you can always go in/out of 4WD, but if you installed the locking hubs, you want to use them, right?)

-Charlie