Record Sales
According to the Recording Industry Association of America (RIAA), AC/DC has sold over 200 million records worldwide, making them one of the best-selling bands of all time. Iron Maiden has sold over 100 million records worldwide, putting them in the top 100 best-selling bands of all time.
Concert Attendance
Both AC/DC and Iron Maiden have played to millions of fans over the course of their careers. AC/DC's biggest concert attendance record was set in 1991, when they played to over 150,000 people at Donington Park in the United Kingdom. Iron Maiden's biggest concert attendance record was set in 2014, when they played to over 110,000 people at Donington Park.
Social Media Followers
As of March 2021, AC/DC has 5.6 million followers on Facebook, 5.3 million followers on Twitter, and 1.6 million followers on Instagram. Iron Maiden has 5.9 million followers on Facebook, 1.8 million followers on Twitter, and 1.6 million followers on Instagram.
Radio Airplay
AC/DC's songs have been played on the radio more than 16 million times in the United States, according to Nielsen Music. Iron Maiden's songs have been played on the radio more than 10 million times in the United States, according to Nielsen Music.
Based on these metrics, it appears that AC/DC is slightly more popular than Iron Maiden. However, both bands have a large and loyal fan base and both bands continue to tour and release new music.