5 Seconds of Summer, Sam Smith, Fifth Harmony, Charli XCX and Schoolboy Q are all facing off at the 2014 MTV Video Music Awards in the Artist to Watch category. Which artist should take home the moonman?

5 Seconds of Summer may have first won our hearts by opening for One Direction, but they quickly developed a rabid fan base on their own, and for good reason: the guys can rock it! 2014 has certainly been their year, with the release of their self-titled debut album and their endlessly catchy hits 'She Looks So Perfect' and 'Don't Stop' -- not to mention the more mellow breakup tune, 'Amnesia.' There's no doubt about it: 5SOS are definitely the next big thing.

Sam Smith introduced himself to the world with 'Stay With Me,' a powerhouse emotional ballad that showcased his rich voice and insane talent. The British crooner certainly has chops -- but he also has staying power, something he has proved by singing the hooks on various other tracks, like Disclosure's 'Latch' and Naughty Boy's 'La La La'.

In 2014, Fifth Harmony toured with some of the biggest acts in pop music, including Demi Lovato and Austin Mahone, all while making their own name for themselves -- something they seriously accomplish on their newest hit, 'BO$$.' The ladies of 5H are ushering in a more mature sound and Harmonziers are equally as excited, ready and willing to devour all of the new music the girls have in store.

Charli XCX has dominated the airwaves this summer, with her hook on Iggy Azalea's 'Fancy' infiltrating just about everyone's ears with its incessantly catchy chorus. But not only can we not stop singing 'Fancy,' we also can't get enough of the British singer's own hit, 'Boom Clap'. 2014 is all about Charli XCX -- and we can't stop watching her.

Schoolboy Q not only scored his first major-label debut this year -- he also landed at the top spot of the Billboard 200. 'Oxymoron' spawned multiple hit singles for Q, including 'Yay Yay,' 'Man of the Year,' 'Collard Greens,' 'Break the Bank' and more, proving the rapper has some serious staying power -- and more hits to come.

Which act should win the 2014 MTV VMA for Artist of the Year? Cast your vote in the poll below!