Two Convertibles with some similarities, but otherwise different in most aspects such as the ground shadow size, height, market segment, and starting price. First of all, the 2018 smart fortwo Convertible is priced $3,810 lower compared to the base MSRP of the 2018 Mazda MX-5 Miata RF. Also, the 2018 MX-5 Miata RF is significantly larger, but the roofline is shorter than that of the 2018 fortwo Convertible. Among similarities are the body structure and maximum occupancy.