Buenos Aires versus Rio de Janeiro is the greatest rivalry in South American city culture — two cities of extraordinary beauty, passion, and personality that represent very different visions of what Latin America can be. Buenos Aires is the Paris of South America — a city of European elegance, extraordinary steak, passionate tango, and a cultural sophistication that makes it one of the most underrated cities in the world. Rio de Janeiro has Carnival, Copacabana, the Christ the Redeemer statue, and a natural setting of mountains and ocean that is arguably the most beautiful of any major city on Earth. Buenos Aires has the architecture and the cuisine. Rio has the beaches and the spectacle. Which South American city deserves the crown?