Although the term "big cat" is usually restricted to the Panthera genus, here i use it as the synonym of the Panterinae subfamily - even more since it's an often generally used word for every larger sized felines including pumas and cheetahs or even more species.
Bigs cats are famous of their ability to roar, thanks to the anatomy of their throats - however in reality this isn't true of either of our finalists, only the other Panthera species: tiger, lion, jaguar and leopard.