Handling
With their comparable turning circles, the Subaru Impreza Outback Sport and the Pontiac Vibe most certainly handle almost the same into and out of tight spots.
Drivetrain
The Pontiac Vibe's engine is significantly smaller than the Subaru Impreza Outback Sport's. Remember that smaller engines can be stressed more; on the flip side, smaller engines are often cheaper to fix.
Torque is the force that lets you accelerate quickly, and in this respect, the Subaru Impreza Outback Sport is significantly more powerful than the Pontiac Vibe.
The Pontiac Vibe could learn a lesson or two from the Impreza Outback Sport in terms of pickup.
Utility
Neither the Pontiac Vibe nor the Subaru Impreza Outback Sport has a marked advantage when it comes to seating capacity.
Convenience
You will quite certainly have to visit your friendly gas station more often with the Pontiac Vibe than with the Subaru Impreza Outback Sport.
Comfort
While the front cabin in the Pontiac Vibe offers a bit more head room than the Subaru Impreza Outback Sport, there frankly isn't much of a difference.
The Pontiac Vibe provides more head- and leg-room to your passengers than the Subaru Impreza Outback Sport does.
Dimensions
The Subaru Impreza Outback Sport is tremendously more bulky than the Pontiac Vibe.
Your wallet will hurt more every time you fill up the Subaru Impreza Outback Sport than the Pontiac because of its larger tank.
The Pontiac and the Subaru Impreza Outback Sport 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 about the same to get the Subaru Impreza Outback Sport to the dealership as the Pontiac Vibe.
The Vibe won't tax your gas budget substantially more than the Subaru Impreza Outback Sport will.
The Vibe isn't much more expensive than the Subaru Impreza Outback Sport with respect to MSRP.
Warranty
The Subaru Impreza Outback Sport and the Pontiac Vibe have the same basic after-sale protection.