According to the Recording Industry Association of America (RIAA), the Eagles have sold over 150 million albums in the United States, making them one of the best-selling music artists of all time. Their greatest hits album, "Their Greatest Hits 1971-1975," is the best-selling album of all time in the United States, with over 38 million copies sold.
The Beach Boys have sold over 100 million albums worldwide, making them one of the best-selling music artists of all time. Their most successful album, "Pet Sounds," is considered one of the greatest albums of all time and has sold over 5 million copies worldwide.
Although both the Eagles and the Beach Boys are extremely successful music artists, the Eagles have sold more albums overall.