manure are not the biggest globally. Certainly in latin america and southern europe barca and Real are seen as much bigger clubs.
You can't judge which of the biggest clubs that are the best..
Madrid fans would say the are, because of their champions league history.. But do trophies won in the 50's count as much as the ones nowadays? Obviously it was alot easier to win it back then, than now. Judging how good a club is by fans isn't really the best way to do it.. Benfica are the worlds best supported club, based on paying supporters. Are they the best club because of that? Are Barca a better club because they one of europes best basket teams and handball teams? They have superb rollerhockey and floorhockey teams? Are they better than others because they give money to UNICEF? Are they better than others because they doesn't have a jersey sponsor? Are Ajax better than for example Chelsea because of their trophies?
Come on guys.. You really can't judge whose club are better.. Every club have different things they stand for, and different way to approach branding etc. etc. etc.
You have barca, Real, mancs, liverpool, ajax, Bayern, AC Milan, Juve.......................then about a 1000000000000000000000000000000 miles below them teams like Benfica, Inter, River, Boca and others I forget.
IMO anyroad.
Value is something that each person defines differently so above would be my value of clubs world wide but someone else would have a different opinion entirely.
In terms of club size there's not a lot to seperate Barça and United, we're both giants of the game with glittering histories.