I love the Sequoia over the Armada. Especially if we are talking brand new.
The QX is on another level though. Compares more to the lexus LX 570 then the other models you mentioned. My sis owns a new QX56 and that thing is a beast.
Nissan makes a Patrol that is the base for the new QX's that ride is also a beast but would compare more to a Land Cruiser.
I own and love the Sequoia Platinum. I love all the extra features of the platinum. Blind side moniter, A/C seats, Air suspension, and is perfect for long road trips or as a kid hauler.
Between, the Armada and Sequoia, i would say sequoia.
But all things condsidered and if brand new is what your looking you can do much worse than a QX.
