Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs approximately the same to get the Mercedes-Benz SL-Class to the dealership as the Porsche Boxster.
When it comes to MSRP, the Porsche Boxster costs tremendously less than the Mercedes-Benz SL-Class.
Utility
Neither the Porsche nor the Mercedes-Benz SL-Class has a marked advantage as far as seating capacity.
Comfort
While the front cabin in the Porsche Boxster offers a bit more head room than the Mercedes-Benz, there honestly isn't much of a difference.
Dimensions
The SL-Class is tremendously more bulky than the Porsche Boxster.
Your wallet will hurt more every time you fill up the Mercedes-Benz SL-Class than the Boxster because of its bigger tank.
The Porsche Boxster and the SL-Class compete for the same parking spaces.
Performance
With respect to horsepower, the Mercedes-Benz SL-Class packs quite a punch and will knock the Porsche Boxster down a few rungs. However, bear in mind that high horsepower engines often command higher insurance premiums.
With that kind of horsepower, both the Porsche Boxster and the Mercedes-Benz SL-Class are legitimate sportscars.
Handling
With their comparable turning radii, the Mercedes-Benz SL-Class and the Porsche Boxster quite certainly handle roughly the same into and out of tight spots.
Drivetrain
The Mercedes-Benz SL-Class has a more sizeable engine than the Porsche Boxster. Remember that smaller engines are often cheaper to fix, but a smaller engine usually has to work a little harder.
Torque is the force that lets you accelerate quickly, and in this respect, the Mercedes-Benz SL-Class is tremendously more powerful than the Porsche Boxster.
The Mercedes-Benz SL-Class packs quite a punch compared to the Boxster as far as torque, which is roughly equivalent to acceleration.
Warranty
The Mercedes-Benz SL-Class and the Porsche Boxster have the same basic warranty.