which is your preferable ways to seek for a supplier? exhibiton or B2B

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this is one of my research ! i know mylot is a good community ,which have all the people from different country and background .what i want to know ,is that if you a big dealer,you should purchase goods from abroad,whether your will use GOOGLE to search supplier ,or just attend the exhibition in the country ,or through the B2B website to seek for supplier! whether i can get your idear ?all the opinions are appreciated !