Late to the party, but instead of asking max vs normal, get the bench seat. I have 3 kids and that is what matters far more. Three adults fit in a row, so you can then fill the back all to the roof. Double strollers, baby beds, baby chair, etc. It all fits.
Also, of course no disrespect, but just as buying a bigger house because you have too much stuff doens't work as you'll just buy even more stuff, if it doesn't fit in a freaking Expedition, the size of the car is not the issue.
My sister in law lives in Europe and takes their tiny cars on multi-day road trips with 3 kids and nothing on the roof. Tents, baby bed, etc. All in there. Just pack light and more efficient. Most of the stuff we bring is convenience. So I'd pick max vs normal based on garage size, price, good deal you may get and like I said get the bench seat.