Please understand, this is a hard question to answer without knowing the history of the vehicles or present conditions. However, here is how I feel. Both vehicles are excellent vehicles. If both were equal in condition, I suspect I would select the Lincoln. And from personal experience, I can tell you the Navigator won't do too good on fuel, but the Nissan will likely do worse. I had a Lincoln and a Titan, which is the truck version of the Armada. It loved fuel.
Both vehicles commonly have issues with exhaust manifolds leaking. The Nissan is known for them to actually crack which is a big repair. As far as the Lincoln, pay attention to see if you notice a ticking from under the hood which could indicate a manifold leak. One more thought. If you decide on the Lincoln, have the seller have the spark plugs replaced for you. They are known to have issues with the threads in the cylinder head to strip. If that happens, it is expensive to repair, so let them take the chance.
I hope this helps. Let me know if you have specific questions.
Monday, July 18th, 2022 AT 10:19 PM