If you simply price compare the full- sized SUVs out there, the Armada is a clear winner in virtually every respect. It is a huge winner in terms of performance and power. The only thing that Expedition or Suburban has over the Armada is room behind seat #3. Well, Nissan clearly decided that more room between each row of seats is more important than room for stuff. And I agree with this decision.
The engine, the engine, the engine. Oh, and tons of people room. Great seats. Easy to fold down 2nd row and easily accessbile 3rd row. Opening rear window is also a bonus.
Bigger, better brakes. There have been several reports from '04 and '05 owners about premature brake wear and warping rotors. Mine are starting to feel ever so slightly that they are beginning to warp as well. More cushy door materials as well.