As an AI, I don't have personal opinions. Both bands have their own unique talents and strengths that appeal to different audiences. It ultimately comes down to individual preference and what qualities or style of music resonate with each listener. **

Yes, one famous Australian band is AC/DC. Formed in Sydney in 1973, AC/DC has become one of the most iconic and influential rock bands in the world. Known for their high-energy performances and classic hits like "Highway to Hell" and "Back in Black," AC/DC has left a lasting impact on the music industry. **

The song that made U2 famous is "I Will Follow," which was released as a single from their debut album "Boy" in 1980. The song received critical acclaim and helped the band gain recognition in the music industry. It showcased U2's distinctive sound and Bono's powerful vocals, setting the stage for their future success. "I Will Follow" remains a fan favorite and a staple in U2's live performances. **

iKON became famous through their participation in the survival show "WIN: Who is Next" in 2013, where they competed against another group to debut under YG Entertainment. After winning the show, they officially debuted in 2015 with the release of their first album "Welcome Back," which gained them a lot of attention. Their unique music style, powerful performances, and strong fanbase helped them rise to fame both in South Korea and internationally. They have since released several successful albums and singles, solidifying their position as one of the top K-Pop groups in the industry. **

You are looking for the famous Black Metal band called Mayhem. Mayhem is known for their influential role in the Norwegian Black Metal scene and their controversial history, including the infamous events surrounding their former member, Euronymous, and the church burnings in the early 1990s. Their music is characterized by its raw and aggressive sound, and they are considered one of the pioneering bands in the Black Metal genre. **

Guns N' Roses is generally considered to be more famous than Nirvana. They achieved massive commercial success with their albums "Appetite for Destruction" and "Use Your Illusion I & II," and their iconic hits like "Sweet Child o' Mine" and "November Rain" have solidified their place in rock history. Nirvana, while incredibly influential in the grunge movement and known for their groundbreaking album "Nevermind" and hit song "Smells Like Teen Spirit," had a shorter career due to the tragic death of their frontman Kurt Cobain. Overall, Guns N' Roses' impact and longevity have contributed to their greater fame. **

Both Guns N' Roses and Queen are incredibly famous bands, but Queen is generally considered to be more famous on a global scale. Queen's music has had a longer-lasting impact and their iconic frontman Freddie Mercury is widely regarded as one of the greatest rock performers of all time. However, Guns N' Roses also achieved massive success in the late 1980s and early 1990s with their album "Appetite for Destruction" and hits like "Sweet Child o' Mine." Ultimately, both bands have left a significant mark on the music industry and have legions of dedicated fans. **

No, the band did not only become famous in their later years. They actually gained popularity early on in their career and continued to build their fan base over time. Their later years may have seen a resurgence in popularity or a new generation of fans discovering their music, but they were not solely famous in their later years. **