Two Convertibles with more similarities, such as the body structure, market segment, and starting price, than differences, like the ground shadow size, height, and maximum occupancy. First of all, the 2018 Ford Mustang Convertible is both significantly larger and slightly taller than the 2018 Mazda MX-5 Miata RF. And finally, the 2018 Mustang Convertible seats two more passengers than the 2018 MX-5 Miata RF. Among similarities are the body structure, market segment, and starting price.