Ever since Super Mario Kart was released for the Super Nintendo Entertainment System, Mario Kart in general has been a number one racing game in many households. Mario Kart DS held the top position in this genre for portable consoles for many years. That is, until Mario Kart 7 was released. With two Mario Kart titles on the shelf that are compatible for the Nintendo 3DS, are both worth purchasing? And, if not, which one?