 Complete the following phrase:  Both clubs compete each other for the title of the most successful football club in the country, as well as the greatest Greek sports club overall. Their football departments have always been the most attractive among their fans and they have a long-standing antagonism since they first met in the fields, but the rivalry also extends into other team sports such as basketball, volleyball and water polo. Domestically, Olympiacos is the most successful football club in Greece, having won a record 79 major official titles compared to Panathinaikos 42 titles and also being the most successful in their head-to-head fixtures. On the other hand, Panathinaikos boast of their better performance in European competitions no Greek team has ever won a European title. Their greatest success is the participation in the European Cup final in 