Drivetrain
The CX-9's engine isn't much more massive than the Ford Flex's.
Torque is the force that lets you accelerate quickly, and in this respect, the CX-9 isn't much more powerful than the Ford.
Utility
Neither the Ford Flex nor the Mazda CX-9 has a marked advantage when it comes to seating capacity.
Convenience
You'll definitely take the Ford Flex for a fill-up about as often as the Mazda CX-9.
Comfort
Taller drivers will significantly enjoy the extra head room in the Ford Flex's front cabin compared to the Mazda CX-9.
The ampler interior dimensions of the Ford Flex make it significantly more spacious for your passengers than the CX-9.
Dimensions
The Ford Flex's tank is roughly the same size as the CX-9's, though the Mazda CX-9's is slightly larger.
The Mazda CX-9 and the Ford Flex compete for the same parking spaces.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The CX-9 is substantially cheaper to get to the dealership than the Ford Flex.
The Mazda CX-9 doesn't pale in comparison to the Ford Flex when it comes to gas mileage.
There honestly isn't much of a difference in gas mileage here, but if you must know, the Ford is a little more economical than the Mazda CX-9.
The Mazda CX-9 isn't much less pricey than the Flex in terms of MSRP.
Overview
The Mazda CX-9 and the Ford Flex have the same basic warranty.