There many views on this but teams with the best results seem to be most popular.
In England, people tend to support the best teams in the Premiership the most - for example Arsenal, Chelsea, Manchester United and Liverpool.
In other countries, people tend to support their best local teams.
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Zinedine Zidane is one.
Zidane never won the UEFA cup. The closest I can find to players who have won everything available to them are Xavi and Iniesta. Again, the only trophy missing is the UEFA cup/Eurpopa League.
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.
With 1155 players, the black population of the NFL runs away with a 68% majority.