I can give some input on the Armada, Tahoe, and Expedition.
The Armada, like the Titan, has one of the most spacious seat areas I've ever been in. I like have room to move around, I'm not a small guy, and on trips I usually carry a lot of stuff. The engine in acceptable for the size of the vehicle, the transmission is adequate. Sorry, I didn't experience a 4x4. But like the Titan, the build quality is cheap, cheap, cheap. The full size Nissans are the first examples that come to mind when when someone talks about poorly fitting, easily broken plastic interiors and body components.
The Tahoe is a good truck, but short on room in the second row. If room is important and your garage will fit, just get the Suburban. Say what you like about Chevys (and I'm a Dodge/Toyota guy), they are generally reliable and they get the job done. Mods are easy to buy and just about anything you can imagine has been done already, so you just need to google whatever mod you are interested in.
The Expedition is similiar to the Tahoe in that it gets the job done with little complaint, but I've never liked the engines in those trucks. They just seem to always be working a little harder than they should be for their size. The one I drove did ride more comfortably than the Tahoe, but it also had a slighly lower cargo capacity and tow rating.