Cost
The Saturn Aura pales in comparison to the Nissan as far as fuel economy.
The Altima Hybrid guzzles a lot of gas compared to the Saturn Aura.
The Saturn isn't much less pricey than the Nissan Altima Hybrid in terms of MSRP.
Utility
Neither the Saturn Aura nor the Nissan Altima Hybrid has a marked advantage when it comes to seating capacity.
Convenience
The Saturn Aura's fuel tank will need to be replenished more often than the unit in the Nissan Altima Hybrid.
Comfort
Taller drivers will considerably enjoy the extra head room in the Altima Hybrid's front cabin compared to the Aura.
The Aura provides more head- and leg-room to your passengers than the Nissan Altima Hybrid does.
Dimensions
Your wallet will hurt more every time you fill up the Altima Hybrid than the Aura because of its bigger tank.
The Nissan and the Saturn Aura compete for the same parking spaces.
Handling
With their similar turning radii, the Nissan Altima Hybrid and the Aura most certainly handle about the same into and out of tight spots.
Drivetrain
The Saturn's engine is slightly smaller than the Nissan Altima Hybrid's, but not terribly so.
Warranty
The Altima Hybrid and the Saturn Aura have the same basic after-sale protection.