Performance
In terms of horsepower, the Subaru Legacy packs quite a wallop and will knock the Mazda MAZDA6 down a few rungs. On the flip side, bear in mind that high horsepower engines often command higher insurance premiums.
Drivetrain
The Subaru Legacy and the Mazda MAZDA6 have similar-sized engines, with a slight advantage to the Mazda MAZDA6.
Utility
The Legacy and the Mazda MAZDA6 can accommodate the same number of passengers.
Dimensions
The Subaru Legacy and the Mazda MAZDA6 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 roughly the same to get the Subaru Legacy to the dealership as the Mazda.
When it comes to MSRP, the Mazda doesn't cost much less than the Subaru Legacy.
Warranty
The Mazda MAZDA6 and the Subaru Legacy have the same basic after-sale protection.