Two Convertibles with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the modifications, starting price, horsepower, and fuel economy. First of all, there is a notable difference in the starting price of the 2017 BMW M6 Convertible, which is $202,600 less than the base MSRP of the 2017 Bentley Continental Convertible Supersports. Also, the 2017 Continental Convertible Supersports has a more powerful engine than the 2017 M6 Convertible, and it gets 3 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.