Two Convertibles with more similarities, such as the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the starting price and horsepower. First of all, the 2016 BMW M6 Convertible is priced $98,700 lower compared to the base MSRP of the 2016 Bentley Continental GT Convertible. And finally, the 2016 M6 Convertible has a more powerful engine than the 2016 Continental GT Convertible. Among similarities are the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy.