Two Convertibles, but completely different in all significant aspects: starting price, horsepower, fuel economy, ground shadow size, model year, height, and maximum occupancy. First of all, there is a $15,135 difference in the base MSRP. The 2016 Buick Cascada, a newer vehicle by two model years, has a higher starting price than the 2014 smart fortwo Convertible. Also, the 2016 Cascada has bigger and thirstier engine; the 2014 fortwo Convertible gets 13 more mpg. In addition, although the Cascada is significantly larger, it has a slightly shorter body than the fortwo Convertible. And finally, the Buick Cascada seats two more passengers than the smart fortwo Convertible. Among similarities is the body structure.