Performance
The Pontiac is likely to feel a bit sluggish because of its high horsepower-to-weight ratio compared to the Mazda MAZDA3.
Handling
With their comparable turning circles, the Mazda MAZDA3 and the Pontiac Vibe doubtless handle approximately the same into and out of tight spots.
Drivetrain
The Pontiac Vibe's engine is substantially smaller than the Mazda MAZDA3's. Remember that a smaller engine usually has to work a little harder; on the other hand, smaller engines are often cheaper to fix.
The Mazda MAZDA3 packs quite a wallop compared to the Vibe as far as torque, which is roughly equivalent to acceleration.
Torque equals pickup, and the Mazda MAZDA3 will have picked up and gone by the time the Pontiac Vibe finally gets moving.
Utility
The Vibe's more sizeable trunk will accommodate more massive objects than the Mazda.
Neither the Pontiac Vibe nor the Mazda MAZDA3 has a marked advantage regarding seating capacity.
Convenience
The Pontiac Vibe's fuel tank will need to be replenished slightly more often than the unit in the MAZDA3.
Comfort
Taller drivers will significantly enjoy the extra head room in the Pontiac's front cabin compared to the Mazda MAZDA3.
While the rear of the Pontiac Vibe offers a bit more head- and leg-room than the Mazda, there frankly isn't much of a difference.
Dimensions
The Pontiac Vibe is likely to feel a bit sluggish because of its high horsepower-to-weight ratio compared to the Mazda MAZDA3.
The Pontiac Vibe's tank is roughly the same size as the Mazda MAZDA3's, though the Mazda MAZDA3's is a little bigger.
The Pontiac Vibe and the Mazda MAZDA3 compete for the same parking spaces.
Cost
In terms of fuel economy, the Pontiac Vibe and the Mazda MAZDA3 don't differ much.
The Vibe isn't much more expensive than the Mazda MAZDA3 regarding MSRP.
Overview
The basic after-sale protection that comes with the Pontiac isn't quite as generous as the Mazda's.
Other
The MAZDA3 emits fewer smog-forming pollutants per 15,000 miles than the Pontiac Vibe.