Utility
Neither the A3 nor the Mazda MAZDASPEED3 has a marked advantage in terms of seating capacity.
Performance
In terms of horsepower, the Mazda MAZDASPEED3 packs quite a wallop and will knock the Audi A3 down a few rungs. On the other hand, keep in mind that high horsepower engines often command higher insurance premiums.
Dimensions
The Audi A3's tank is roughly the same size as the Mazda MAZDASPEED3's, though the Mazda MAZDASPEED3's is a bit bigger.
The Audi A3 and the MAZDASPEED3 compete for the same parking spaces.
Convenience
You will most certainly have to visit your friendly gas station more often with the Mazda MAZDASPEED3 than with the Audi A3.
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 Mazda MAZDASPEED3 to the dealership as the Audi A3.
The MAZDASPEED3 will tax your gasoline budget tremendously more than the Audi A3 will.
The Mazda requires a lot of gas compared to the Audi.
With respect to MSRP, the Audi A3 costs significantly more than the Mazda MAZDASPEED3.
The Audi will save you a lots_of_money at the pump every year compared to the Mazda MAZDASPEED3.
The MAZDASPEED3 will cost you a lots_of_money in gas every year compared to the Audi A3.
Handling
With their similar turning circles, the Audi and the Mazda MAZDASPEED3 quite certainly handle almost the same into and out of tight spots.
Drivetrain
The Audi A3's engine is substantially smaller than the Mazda MAZDASPEED3's. Keep in mind that a smaller engine usually has to work a little harder; on the flip side, smaller engines typically get better gas mileage.
The Mazda MAZDASPEED3 packs quite a punch compared to the Audi A3 regarding torque, which is roughly equivalent to acceleration.
Comfort
While the front cabin in the Audi A3 offers a bit more head room than the MAZDASPEED3, there really isn't much of a difference.
The MAZDASPEED3 provides more head- and leg-room to your passengers than the Audi A3 does.
Warranty
The basic after-sale protection that comes with the Mazda MAZDASPEED3 isn't quite as generous as the Audi A3's.