Barcelona are the best because they have got one of the best players in the world (messi) and they one against man utd so that just proves it.
Barcelona are currently better than Man Utd, but Man Utd have a better and good history in the 80's and 90's and the rest before.
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FC Barcelona. They have the best player in the world and they got way more club and individual titles and championships. Man UTD is a good team but it doesn't reach Barcelona's or Real Madrid's level.