I just checked the specs.
Flex is 201.9 inches long and 75.9 inches wide
Acadia is 201.1 inches long and 78.9 inches wide.
Ford doesn't mention weight figures on their site but the AWD Acadia is 4925 lbs.
At $50 grand, although it would be fully loaded, there are others out there that might be considered, but the one that might be worth waiting for in the price range will be thew new GLK, especially if they bring the diesel!