Green Day formed in 1987 in California and released their first album, 39/Smooth, in 1991. They rose to fame in the mid-1990s with their album Dookie, which was certified diamond by the RIAA and sold over 20 million copies worldwide. Green Day has released a total of 13 studio albums, the most recent of which is Father of All..., which was released in 2020.
Nickelback formed in 1995 in Canada and released their first album, Curb, in 1996. They gained popularity in the early 2000s with their albums Silver Side Up and The Long Road, both of which were certified triple platinum by the RIAA and sold over 10 million copies worldwide. Nickelback has released a total of 9 studio albums, the most recent of which is Get Rollin', which was released in 2022.
Both Green Day and Nickelback have had successful careers and have sold millions of albums worldwide. They have both been nominated for numerous awards and have won several, including Grammy Awards and Juno Awards. Ultimately, the best band is a matter of personal preference.