Performance
As far as horsepower, the Mazda MAZDA3 packs quite a wallop and will knock the Toyota Yaris down a few rungs. On the other hand, note that high horsepower engines often command higher insurance premiums.
Handling
Really small tires, like the ones on the Toyota, can provide better handling in deep snow but might also look a little odd.
With their similar turning circles, the Toyota Yaris and the Mazda MAZDA3 definitely handle roughly the same into and out of tight spots.
Drivetrain
The Toyota Yaris's engine is considerably smaller than the Mazda's. Keep in mind that smaller engines can be stressed more; however, smaller engines typically get better gas mileage.
Torque is the force that lets you accelerate quickly, and in this respect, the Mazda MAZDA3 is quite a bit more powerful than the Toyota Yaris.
The Toyota Yaris could learn a lesson or two from the Mazda MAZDA3 as far as torque.
Utility
Neither the Toyota Yaris nor the Mazda MAZDA3 has a marked advantage in terms of seating capacity.
Convenience
You doubtless won't have to visit your friendly gas station more often with the Yaris than with the Mazda MAZDA3, because both offer similar mileage ranges.
Comfort
While the front cabin in the Mazda offers a bit more head room than the Toyota Yaris, there really isn't much of a difference.
While the rear of the Mazda MAZDA3 offers a bit more head- and leg-room than the Toyota Yaris, there really isn't much of a difference.
Dimensions
The Mazda is substantially heavier than the Toyota Yaris.
Your wallet will hurt more every time you fill up the Mazda MAZDA3 than the Toyota Yaris because of its larger tank.
The Toyota rides lower than the Mazda MAZDA3, which is a good thing for its center of gravity and ease of access.
The Toyota and the Mazda MAZDA3 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 approximately the same to get the Mazda MAZDA3 to the dealership as the Toyota Yaris.
The Mazda MAZDA3 consumes a lot of gasoline compared to the Toyota Yaris.
With respect to fuel economy, the Toyota Yaris has the Mazda beat.
As far as MSRP, the Mazda MAZDA3 costs considerably more than the Toyota Yaris.
The Toyota Yaris is substantially less costly than the Mazda in terms of final price.
The Yaris will save you a bundle at the pump every year compared to the Mazda.
The Mazda MAZDA3 will cost you a bundle in gasoline every year compared to the Toyota Yaris.
Overview
The Mazda MAZDA3 and the Toyota Yaris have the same basic warranty.