Two Convertibles with some similarities, but otherwise different in most aspects such as the ground shadow size, horsepower, height, and maximum occupancy. First of all, the 2017 Buick Cascada has a more powerful engine than the 2017 Mazda MX-5 Miata RF. Also, not only 2017 Cascada is significantly larger, but it's also slightly taller than the 2017 MX-5 Miata RF. And finally, the Cascada seats two more passengers than the MX-5 Miata RF. Among similarities are the body structure and starting price.