Between back to school shopping and fashion week, September is truly the month of fashion reinventions and celebrating personal style—and who are more stylish than our resident reigning pop stars?

PopCrush Best Dressed is a month-long competition to determine the ultimate style stars of 2017!

One's a bona fide solo pop prince, the other a rising rap rock star and one half of twenty one pilots. Both have their own one-of-a-kind personal style: Justin Bieber and Tyler Joseph go head to head during Round 1, but which musician comes out on top?

The battle begins right now: Place your vote between Justin Bieber and Tyler Joseph for 2017’s Best Dressed! Round 1 ends Monday, September 18 at 11:59 p.m. EST.

Justin Bieber's Hottest Instagram Photos: