Austin Mahone is on a roll! The singer's 'Waiting for This Love' just won its second Pop Clash in a row -- and now faces off against Demi Lovato's 'Nightingale.' Which track should win the Pop Clash?

Austin brings the heat in 'Waiting for This Love' -- not that we're complaining. It's a sultry song beyond his years, yet he completely nails it. Austin is sharing a glimpse of his more mature side and we can only hope he's got more music in this vein. In the meantime, we'll just obsess over how amazing 'Waiting for This Love' is.

Demi brings all of the emotion in her powerful 'Nightingale.' The ballad is raw, stunning and from-the-heart. In other words, it captures everything we love about Demi and her music. Seriously, it straight-up gives us chills and for all the right reasons.

Who should win this week's Pop Clash? You can vote for Austin or Demi until the poll closes at 3PM ET on Jan. 12.

Listen to Austin Mahone's 'Waiting for This Love'

Watch Demi Lovato's 'Nightingale'