Handling
With their similar turning radii, the Subaru Impreza and the MAZDASPEED3 quite certainly handle about the same into and out of tight spots.
Drivetrain
The Mazda MAZDASPEED3 and the Subaru Impreza have similar-sized engines, with a slight advantage to the Subaru Impreza.
The Mazda MAZDASPEED3 packs quite a wallop compared to the Subaru Impreza as far as torque, which is roughly equivalent to acceleration.
The Impreza could learn a lesson or two from the MAZDASPEED3 regarding pickup.
Utility
The Impreza and the Mazda MAZDASPEED3 can accommodate the same number of passengers.
Convenience
You'll likely take the MAZDASPEED3 for a fill-up almost as often as the Subaru Impreza.
Comfort
Taller drivers will considerably enjoy the extra head room in the Subaru Impreza's front cabin compared to the MAZDASPEED3.
The MAZDASPEED3 provides more head- and leg-room to your passengers than the Subaru Impreza does.
Dimensions
The Mazda's tank is almost the same size as the Impreza's, though the Subaru's is somewhat larger.
The Subaru and the Mazda MAZDASPEED3 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. It costs roughly the same to get the Subaru to the dealership as the Mazda MAZDASPEED3.
The Subaru Impreza isn't much more expensive than the Mazda MAZDASPEED3 with respect to MSRP.
Warranty
The MAZDASPEED3 and the Subaru Impreza have the same basic after-sale protection.