Justin Bieber won by 9 votes! Vote for him the next and final round here!

It's a battle of the teen idols! Last week, Justin Bieber took the Pop Clash championship from Katy Perry, and this week he's up against yet another formidable foe. JB's 'Heartbreaker' is taking on One Direction's 'Story of My Life.' Who do you think should win?

Bieber cuts deep with 'Heartbreaker.' The slow-burning jam doesn't have the pep of 'Baby' or the fast-talking of 'Beauty and a Beat,' but it's got a lot of soul. The uber-confident singer shows his vulnerability, admitting he's not perfect and that he does the best he can. We love that Bieber's willing to get emotional, but we also appreciate that the track showcases his ability to croon with the best of 'em.

One Direction are also at their best with 'Story of My Life.' Following the summer smash 'Best Song Ever,' the boys take things down a notch with this new song. Like Bieber, the boys are throwing all of their emotions into this one. Rather than apologizing, however, the guys harmonize about going after true love. (Yeah, we're melting a little too.) They truly shine during the chorus, when their unified voices result in a powerful delivery.

Who do you think should win this week's Pop Clash? You can vote once an hour until the polls close at 3PM ET on Monday, Nov. 4.

Listen to Justin Bieber, 'Heartbreaker'

Listen to One Direction, 'Story of My Life'