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 fresh, fun-loving funk-pop icon, while the other is an unapologetic glam rocker: Both Bruno Mars and Adam Lambert boast their own unique, polar opposite style... But which American performer edges out the other?

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

Adam Lambert Through the Years: