They both suck balls and they aren't even good, if toi want to hear a band with REAL musique then try listening to this singer who is the lead vocalist of two bands. His name is Tim Lambesis.
Oh your not going to like the réponses people give toi par asking this.
For their musique they both sing bad in my opinion. For how they act I would say One Direction because after what Justin did I will never respect that guy. He doesn't even deserve to have fans after what he did. Honestly,personally I prefer 1D outside the whole musique thing.