Utility
The Pontiac Vibe and the Mazda MAZDA6 can accommodate the same number of passengers.
Performance
In terms of horsepower, the MAZDA6 packs quite a punch and will knock the Pontiac Vibe down a few rungs. However, keep in mind that high horsepower engines often command higher insurance premiums.
The Pontiac Vibe is likely to feel a tad sluggish because of its high horsepower-to-weight ratio compared to the Mazda MAZDA6.
Dimensions
The Mazda MAZDA6 is substantially more ponderous than the Pontiac Vibe.
Your wallet will hurt more every time you fill up the Mazda MAZDA6 than the Pontiac Vibe because of its larger tank.
The Pontiac Vibe rides lower than the Mazda MAZDA6, which is a good thing for its center of gravity and ease of access.
The Pontiac and the Mazda MAZDA6 compete for the same parking spaces.
Convenience
The Vibe's fuel tank will need to be replenished somewhat more often than the unit in the MAZDA6.
Cost
The Pontiac Vibe will save you money at the pump compared to the Mazda MAZDA6.
The Mazda MAZDA6 is quite a bit costlier than the Vibe regarding MSRP.
Handling
The MAZDA6 and the Pontiac have about comparable tires.
With their similar turning radiuses, the Pontiac Vibe and the Mazda MAZDA6 very likely handle about the same into and out of tight spots.
Drivetrain
The Mazda MAZDA6's engine is tremendously larger than the Pontiac Vibe's. Note that larger engines may use more gasoline than smaller ones.
The Mazda MAZDA6 packs quite a wallop compared to the Vibe in terms of torque, which is roughly equivalent to acceleration.
Comfort
Taller drivers will markedly enjoy the extra head room in the Pontiac Vibe's front cabin compared to the Mazda MAZDA6.
The Pontiac Vibe is not particularly roomier for your passengers than the Mazda.
Overview
The basic after-sale protection that comes with the Vibe isn't quite as generous as the Mazda's.