Lets consider that the Suburban has 3rd row...If you can fold down both 2nd and 3rd rows, by sheer length of the vehicle the Suburban would have more trunk space than the cherokee even with the new body style. With the back seat up, the Grand Cherokee (2011) has 38.3 cu ft of storage. With the back seat folded it has 68.3 cu ft of storage space. I sell Jeep, Dodge, Ram, and Chrysler so I favor my own products, but storage space wise I would give the edge to the Suburban just by total vehicle size.