Two Convertibles with more similarities, such as the body structure, market segment, height, and maximum occupancy, than differences, like the starting price, horsepower, fuel economy, and ground shadow size. First of all, there is a $95,740 difference in the base MSRP. The 2016 Maserati GranTurismo Convertible has a higher starting price than the 2016 BMW 4 Series Convertible. Also, the 2016 GranTurismo Convertible has a more powerful engine and gets 10 mpg less than the 2016 4 Series Convertible. And finally, the 4 Series Convertible is slightly smaller than the GranTurismo Convertible. Among similarities are the body structure, market segment, height, and maximum occupancy.