Cost
The Ford Flex doesn't pale in comparison to the Ford Edge in terms of gas mileage.
With respect to MSRP, the Ford Edge doesn't cost much less than the Flex.
Utility
Drivers with frequent kid-duty might favor the Ford Flex over the Ford Edge.
Convenience
The Ford Flex's fuel tank will need to be replenished slightly more often than the unit in the Ford Edge.
Comfort
Taller drivers will considerably enjoy the extra head room in the Ford Flex's front cabin compared to the Ford Edge.
The Ford Flex offers more head- and leg-room to your passengers than the Ford Edge does.
Dimensions
The Flex's tank is almost the same size as the Ford Edge's, though the Ford Edge's is somewhat bigger.
The Ford Edge and the Ford Flex compete for the same parking spaces.
Drivetrain
Torque is roughly equivalent to acceleration, and in this respect, the Edge isn't much more powerful than the Ford Flex.
The Ford Flex has no lessons to learn with respect to pickup from the Ford Edge.
Overview
The Edge and the Flex have the same basic warranty.