Two Convertibles with more similarities, such as the body structure, market segment, ground shadow size, and height, than differences, like the modifications, starting price, horsepower, fuel economy, and maximum occupancy. First of all, there is a notable difference in the starting price of the 2016 Mercedes-Benz SL-Class SL 63 AMG, which is $32,309 less than the base MSRP of the 2016 Maserati GranTurismo Convertible MC Centennial. Also, a bigger engine usually means less mpg. But the 2016 SL-Class SL 63 AMG has a more powerful engine and it gets 4 more mpg than the 2016 GranTurismo Convertible MC Centennial. In addition, the GranTurismo Convertible MC Centennial seats two more passengers than the SL-Class SL 63 AMG. Among similarities are the body structure, market segment, ground shadow size, and height.