Two Convertibles with some similarities, but otherwise different in most aspects such as the model year, modifications, starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2018 Alfa Romeo 4C Spider is priced $55,400 lower compared to the base MSRP of the 2022 Porsche 911 Targa, which is newer by four model years. Also, the 2022 911 Targa has a more powerful engine and gets 8 mpg less than the 2018 4C Spider. In addition, the 4C Spider is both slightly smaller and shorter than the 911 Targa. And then, you'll seat two more passengers in the Porsche 911 Targa than in the Alfa Romeo 4C Spider. Among similarities are the body structure and market segment.