Two Convertibles with more similarities, such as the body structure, market segment, horsepower, ground shadow size, and maximum occupancy, than differences, like the fuel economy, starting price, and height. First of all, there is a notable difference in the starting price of the 2017 Mercedes-Benz S-Class Convertible, which is $14,340 less than the base MSRP of the 2017 Maserati GranTurismo Convertible. Also, you get 5 more mpg with the 2017 GranTurismo Convertible than with the 2017 S-Class Convertible. And finally, the GranTurismo Convertible is slightly shorter than the S-Class Convertible. Among similarities are the body structure, market segment, horsepower, ground shadow size, and maximum occupancy.