Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the Kia to the dealership as the MAZDA3.
The Mazda MAZDA3 pales in comparison to the Kia Forte as far as fuel economy.
With respect to gas mileage, the Kia Forte beats the Mazda.
In terms of MSRP, the Kia Forte costs considerably less than the Mazda MAZDA3.
Utility
Neither the Mazda MAZDA3 nor the Kia Forte has a marked advantage when it comes to seating capacity.
Convenience
You likely won't have to visit your friendly gas station more often with the Mazda than with the Kia Forte, because both offer similar ranges.
Comfort
Taller drivers will substantially enjoy the extra head room in the Kia Forte's front cabin compared to the Mazda MAZDA3.
While the rear of the MAZDA3 provides a bit more head- and leg-room than the Kia Forte, there frankly isn't much of a difference.
Dimensions
Your wallet will hurt more every time you fill up the Mazda MAZDA3 than the Kia Forte because of its larger tank.
The Kia Forte and the Mazda MAZDA3 compete for the same parking spaces.
Handling
With their similar turning radii, the Kia Forte and the Mazda MAZDA3 most certainly handle approximately the same into and out of tight spots.
Drivetrain
The Mazda MAZDA3 has no lessons to learn as far as torque from the Kia Forte.
Warranty
The basic warranty that comes with the MAZDA3 isn't quite as generous as the Kia Forte's.