Utility
The Ford Focus and the MAZDA3 can accommodate the same number of passengers.
Dimensions
Your wallet will hurt more every time you fill up the Mazda MAZDA3 than the Ford Focus because of its bigger tank.
The Ford Focus and the Mazda MAZDA3 compete for the same parking spaces.
Convenience
You likely won't have to visit your friendly gas station more often with the Mazda MAZDA3 than with the Ford, as both offer comparable mileage ranges.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs almost the same to get the Ford Focus to the dealership as the MAZDA3.
Regarding gas mileage, the Ford Focus bests the Mazda MAZDA3.
Regarding gas mileage, the Ford Focus has the MAZDA3 beat.
The Mazda isn't much more expensive than the Focus regarding MSRP.
Drivetrain
The MAZDA3 has no lessons to learn when it comes to torque from the Ford.
Torque is the force that lets you accelerate quickly, and in this respect, the Ford Focus isn't much more powerful than the Mazda MAZDA3.
Comfort
While the front cabin in the Ford Focus offers a bit more head room than the Mazda, there really isn't much of a difference.
The Ford Focus is not particularly more spacious for your passengers than the Mazda MAZDA3.
Warranty
The Mazda MAZDA3 and the Focus have the same basic after-sale protection.