The most important things are how you use the truck and what sort of terrain you encounter regularly. If you're on the road a lot and not much off-pavement, I'd go for a set of AT tires. If you're off road an in the mud all the time an not much pavement, get muds.
My Ranger sees mostly road use, but with working construction I often have to get off the road on a job somewhere so I wanted a tire that would bite. I didn't want muds because for the most part I didn't need 'em (plus muds tend to wear faster than AT tires). After seeing BFG AT tires turn into chocolate doughnuts at the mere sight of mud, I didn't want them either (not to mention just about everyone around here runs 'em on their yuppiemobiles). I looked around and settled on a set of Sport King AT tires and I've been impressed. The grip on wet pavement leaves a lil to be desired (they're about as good as any mud tire I've run but a lil worse than a normal street tread), but everything else from snow to ice to hardpack snow to dirt, gravel and mud, they've done better than I've expected. Treadwear has been good too, I have about 40k miles on 'em an there's still life left there, and I put some hard miles on too (burnouts an such). For 30" tires they were about a hundred each, a bit cheaper than BFGs.