I would not believe rankings very much, as there are flaws in the design of the surveys/questionnaires that can be a little bit manipulated by Schools and Alumni, giving some surprises as a result.
What general knowledge says: in Spain there's no doubt IESE is number one in quality, history and professors. I think it is accepted that ESADE is number two, with good quality on the MBA also. IE actually is far away from these two... but they do very well on rankings.
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