Two Convertibles with some similarities, but otherwise different in most aspects such as the starting price, ground shadow size, horsepower, height, and maximum occupancy. First of all, there is a $9,095 difference in the base MSRP. The 2016 Buick Cascada has a higher starting price than the 2015 Mazda MX-5 Miata. Also, the 2016 Cascada has a more powerful engine than the 2015 MX-5 Miata. In addition, the Cascada is both significantly larger and slightly taller than the MX-5 Miata. And finally, you'll seat two more passengers in the Buick Cascada than in the Mazda MX-5 Miata. Among similarities are the body structure and fuel economy.