Bud is not even in top-20 best selling brands in Europe and doesn't have top position in any European country, Bud is popular only in Americas. Best selling brand in European continent is Baltika, thanks to really big Russian market. Among the other most popular brands in Europe are Carling, Krombacher, Carlsberg, Heineken, Guiness.
Bud is the most popular beer not only in Europe but also in the whole world with the maximum number of consumption throughout the world. Popularity can be judged by number of sales. So does bud have.