Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The average convertible is considerably cheaper to get to the dealership than the Porsche 911.
The Porsche 911 doesn't pale in comparison to the average convertible with respect to fuel economy.
The 911 is tremendously more expensive than the average convertible in terms of MSRP.
Utility
Drivers with frequent kid-duty might favor the Porsche 911 over the typical convertible.
Convenience
The average convertible's fuel tank will need to be replenished slightly more often than the unit in the Porsche 911.
Comfort
While the front cabin in the average convertible offers a bit more head room than the 911, there frankly isn't much of a difference.
Dimensions
The average convertible's tank is about the same size as the Porsche 911's, though the Porsche 911's is somewhat larger.
The average convertible and the Porsche 911 compete for the same parking spaces.
The average convertible's longer wheelbase will likely result in a smoother, more stable ride; however, the Porsche 911 may give a sprier feel in daily traffic.
Handling
With their similar turning circles, the Porsche 911 and the average convertible quite certainly handle almost the same into and out of tight spots.
Drivetrain
The typical convertible and the Porsche 911 have similar-sized engines, with a slight advantage to the Porsche 911.
The Porsche 911 packs quite a wallop compared to the typical convertible in terms of torque, which is roughly equivalent to acceleration.
Warranty
The basic after-sale protection that comes with the typical convertible isn't quite as generous as the 911's.