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 Cadillac CTS-V to the dealership as the Audi.
When it comes to MSRP, the Cadillac CTS-V doesn't cost much less than the Audi.
Utility
Neither the Audi A6 nor the CTS-V has a marked advantage as far as seating capacity.
Comfort
Taller drivers will substantially enjoy the extra head room in the Cadillac CTS-V's front cabin compared to the Audi.
The Audi is not particularly more spacious for your passengers than the Cadillac.
Dimensions
The A6 is a little more ponderous than the Cadillac CTS-V.
Your wallet will hurt more every time you fill up the Audi A6 than the Cadillac CTS-V because of its larger tank.
The Cadillac CTS-V and the Audi A6 compete for the same parking spaces.
Drivetrain
The Cadillac's engine is markedly more massive than the Audi's. Remember that more sizeable engines may use more gas than smaller ones.
The Cadillac CTS-V packs quite a punch compared to the Audi A6 as far as torque, which is the force that lets you accelerate quickly.
Overview
The Cadillac CTS-V and the Audi A6 have the same basic warranty.
Other
The Cadillac emits fewer smog-forming pollutants per 15,000 miles than the Audi A6.