They both suck balls and they aren't even good, if tu want to hear a band with REAL música 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 respuestas people give tu por asking this.
For their música 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 música thing.