Split - Justin Bieber and Bruno Mars
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Decisions, decisions, decisions: In one corner we have a well-coifed young superstar by the name of Justin Bieber; in the other corner, there's pompadoured popster Bruno Mars. Their new videos, for "As Long As You Love Me" and "Locked Out of Heaven," respectively, are battling it out in our Top 40 of 2012 video contest. Which one will you choose to advance to the next round?

Yes, Bieber is a wee lad, and yes, his spiked new 'do is a departure from the legendary swoop that launched a million tween imitations (see the evolution of his hair!). But it'd be foolish to underestimate a teenager with such undeniable swag (and top notch hair product). Plus, in the video, Bieber gets slapped around by Kill Bill actor Michael Madsen, so you know he's tough (and his hair still looks good after the beating).

But Bruno Mars is no lightweight, least of all in the hair department. Sure, he's never had a cut as revolutionary as Bieber's swoop – his locks have more of a 1950s greaser vibe to them – but it's clear he puts major effort into that 'do. And in the "Locked Out of Heaven" clip, Mars' hair remains perfect despite being in what's apparently the world's sweatiest club. That's composure in the heat of the moment.

So, voters: Who has the better hair? Let us know by voting in our Top 40 poll! Right now, Bieber is winning 73% to 27%, so Bruno Mars fans better rally to their man's cause.

And, of course, feel free to argue your decision in the comments!