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 MAZDA3 to the dealership as the Volkswagen GTI.
Regarding fuel economy, the Mazda MAZDA3 and the Volkswagen GTI don't differ much.
The Volkswagen is quite a bit costlier than the MAZDA3 in terms of MSRP.
Regarding out-the-door cost, the Volkswagen GTI costs quite a bit more than the Mazda MAZDA3.
Utility
The GTI's larger trunk will accommodate more massive items than the Mazda MAZDA3.
Neither the Mazda MAZDA3 nor the GTI has a marked advantage regarding seating capacity.
Convenience
You doubtless won't have to visit your friendly gas station more often with the GTI than with the MAZDA3, because both offer comparable mileage ranges.
Comfort
While the front cabin in the Mazda MAZDA3 offers a bit more head room than the GTI, there really isn't much of a difference.
The ampler interior dimensions of the MAZDA3 make it considerably more spacious for your passengers than the Volkswagen GTI.
Dimensions
The Volkswagen GTI is somewhat heavier than the Mazda MAZDA3.
The Volkswagen GTI and the Mazda MAZDA3 compete for the same parking spaces.
Handling
With their comparable turning circles, the Mazda and the GTI doubtless handle about the same into and out of tight spots.
Drivetrain
The Volkswagen GTI's engine is considerably smaller than the Mazda MAZDA3's. Remember that smaller engines can be stressed more; on the flip side, smaller engines are often cheaper to fix.
The Mazda MAZDA3 could learn a lesson or two from the Volkswagen GTI regarding pickup.
Overview
The Volkswagen GTI and the Mazda have the same basic warranty.
Other
The Mazda MAZDA3 emits fewer smog-forming pollutants per 15,000 miles than the Volkswagen GTI.