It's the timeless debate between pop fans who lived through the late '90s / early '00s: 'N Sync or Backstreet Boys? Back in they heyday, these two quintets pretty much ruled the airwaves and television, with their songs bumping from car stereos and headphones all over the world and their music videos playing on repeat on networks like MTV. Oh, and don't forget the sold-out world tours! 

We want PopCrush readers to weigh in on who's the better boy band, 'N Sync or the Backstreet Boys. If you're having trouble deciding, here's some reminders as to why both groups were so great. First of all, 'SexyBack' crooner Justin Timberlake was pretty much the de facto frontman of 'N Sync, taking lead vocals on many songs and making young girls scream with his good looks and dance moves (JC was also a stud, just FYI). BSB, on the other hand, never really had an unestablished leader of the pack, but AJ, Nick, and Brian all seemed to sing lead more than Kevin and Howie.

If you didn't have a favorite member of either group that you gravitated too, then there's probably a chance that you would've (or still would) rather gotten down to songs in either 'N Sync or BSB's discography. During their run, 'N Sync cranked out hits like 'Tearin' up My Heart,' 'Bye Bye Bye,' and 'It's Gonna Be Me.' Backstreet Boys also stole the hearts of fans with tracks like 'Everybody (Backstreet's Back),' 'I Want It That Way,' and 'Larger Than Life.'

So, PopCrush readers and boy band lovers, let's settle this battle once and for all. Who is better, 'N Sync or Backstreet Boys? Cast your vote below!