I'd just get the Expedition. And if they give you a Suburban, just take that. But I am intrigued by the new Fords, though I can't see myself buying one. Had a 2016 F150 as a rental and it was great.
I use Hertz gold so I get to choose which car and drive to the exit without going to the counter.
The Surburban is in the Premium extra capacity SUV category along with the Expedition EL. I have a booking for the Luxury category (Navigator or Escalade) for the same price as the Surburban category.
The full size SUV category is much cheaper but only the Expedition has the 3rd row space.
Just in case an Expedition, Navigator or even Escalade ESV are not available, I also have a Surburban category reservation to make sure I have 3rd row space, but that is my 3rd choice.