The master and his former protege release albums within a week of each other. But at this stage of their careers - 33-year-old Usher has been at it for almost 20 years and 18-year-old Bieber just four - the roles have changed somewhat.
It was Usher who fought Justin Timberlake in a bidding war to sign Bieber back when the Ontario kid was a YouTube phenomenon and soon to be the biggest male music star on the planet.
And these days, though Usher is still a giant of the R&B pop world, on seventh album Looking 4 Myself he struggles to match 2004's classic Confessions, which had the stealth and suave future soul of Yeah! on it.
So it's Bieber who's a clear winner here. On his third studio album in three years he has grown up and dispensed with the sugary teenybopper pop of tracks like Baby - well, almost because there are still hints of the innocent sweetness that screaming teenage girls the world over love most about him.
But Bieber, and his cast of songwriters and producers, have moved his sound on to a more mature level, from the mix of haunting electronics and acoustic guitar of first single Boyfriend, to the dubstep-infused (but thankfully not dominant) As Long As You Love Me where he aches rather than simpers.