Director Morgan Spurlock believes One Direction's new film is better than Justin Bieber's Never Say Never.

The British-Irish boyband held the premiere for their debut movie This Is Us yesterday (August 20) in London and it seems the flick will be a huge success.

Bieber released similar film Never Say Never in 2011 but speaking to Capital FM, Spurlock believes This Is Us is better by virtue of One Direction's numbers. He said:

"We've got five singers in this band so I think it's already five times better. Now what I'm hoping is that it's five times as successful."

Spurlock meanwhile also joked that he feels like a sixth member of the band following his time spent filming the group.