Two Convertibles with some similarities, but otherwise different in most aspects such as the model year, starting price, horsepower, ground shadow size, and height. First of all, the 2014 BMW 6 Series Convertible is priced $13,300 lower compared to the base MSRP of the 2016 Porsche 911 Convertible, which is newer by two model years. Also, the 2016 911 Convertible has a more powerful engine than the 2014 6 Series Convertible. And finally, the 6 Series Convertible is both slightly larger and taller than the 911 Convertible. Among similarities are the body structure, market segment, fuel economy, and maximum occupancy.