Justin Bieber is a pop icon. He was signed by Usher, and this has given him great crossover appeal. He has a diverse fan base of black and white fans. His success may have been somewhat different if he was signed with Justin Timberlake.
Justin Timberlake is huge star, but he also has a heavy R&B sound. He has entire albums that have been produced by Timberland. This accounts for his appeal in the black community, but he still has a larger white fan base. He’s always been considered a pop artist.
If Justin Bieber was signed by Timberlake he would probably have a Timberland sound. He would also have more white fans and a better album. The Bieber machine is going strong, but Justin Bieber doesn’t have a lot of hit singles. Most of his fans are into his looks. They like and buy his music, but he has not really dominated the charts. If Justin Timberlake was managing Bieber he would definitely have more singles being released from the album.
Bieber appears to take mimic Usher with multiple dance routines. Timberlake also dances, but he would probably take more time to develop Bieber’s musicianship skills for the stage.