Two Convertibles with some similarities, but otherwise different in most aspects such as the horsepower, ground shadow size, height, fuel economy, and maximum occupancy. First of all, the 2019 Mercedes-Benz E-Class Cabriolet has a more powerful engine and gets 5.5 mpg less than the 2018 Alfa Romeo 4C Spider. Also, the 2018 4C Spider body is significantly smaller than the 2019 E-Class Cabriolet, and in addition to that, it's also shorter. And finally, you'll seat two more passengers in the E-Class Cabriolet than in the 4C Spider. Among similarities are the body structure, market segment, and starting price.