It’s very famous - not just in Argentina, but all over the world. The fans are so partisan, they really go for it. People prepare for the game and will be talking about it a week ahead of kick-off, if not earlier!
Everyone is discussing it in the media but in the streets as well, the fans will be building up to it. The whole country grinds to a halt to watch the game. Not just in Buenos Aires; Boca-River is massive throughout the whole country and so everyone is watching it and hanging on the result.
I would say that is the best comparison to what United and Liverpool have in England, and that is why I was among the away fans at Anfield a couple of years ago.