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Toyo has a great rep on the board here, and Mickeys tend to be more expensive (at least where I'm from), so draw your own conclusion there. That being said, Nitto makes two awesome MTs, BFG KM2s are quality tires, and Super Swamper IROK Radials or SSRs are impressive off road even on heavy trucks.
If you tell us more, we can help you out a lot more. I guess for starters, how'd you pick those two brands?