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 $200,300 difference in the base MSRP. The 2018 Bentley Continental GT Supersports has a higher starting price than the 2018 BMW M6. Also, the 2018 Continental GT Supersports has a more powerful engine than the 2018 M6, and it gets 2 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.