Handling
With their comparable turning circles, the Mazda MAZDA6 and the Volkswagen Jetta likely handle almost the same into and out of tight spots.
Drivetrain
The Mazda MAZDA6's engine isn't much more sizeable than the Volkswagen Jetta's.
The Mazda MAZDA6 has no lessons to learn when it comes to pickup from the Volkswagen Jetta.
Torque is the force that lets you accelerate quickly, and in this respect, the Jetta isn't much more powerful than the Mazda MAZDA6.
Utility
Neither the Volkswagen Jetta nor the MAZDA6 has a marked advantage regarding seating capacity.
Comfort
While the front cabin in the Mazda MAZDA6 offers a bit more head room than the Volkswagen Jetta, there frankly isn't much of a difference.
The ampler interior dimensions of the Mazda MAZDA6 make it more spacious for your passengers than the Volkswagen Jetta.
Dimensions
Your wallet will hurt more every time you fill up the Mazda MAZDA6 than the Volkswagen Jetta because of its bigger tank.
The Volkswagen Jetta and the MAZDA6 compete for the same parking spaces.
The Jetta's shorter wheelbase may produce a less-settled highway ride but a more agile feel in daily traffic than the Mazda MAZDA6.
Cost
Regarding MSRP, the Mazda MAZDA6 costs approximately as much as the Volkswagen Jetta (though the Volkswagen Jetta is a tad cheaper).
Warranty
The Mazda MAZDA6 and the Volkswagen Jetta have the same basic warranty.