I dislike both of them and their cheesy, cheap and tacky brand of pop music, they're the kind of acts that will fizzle out in a few years so they are trying to release as much of their crap while they can.
The 1D guys seem ok as people, but Justin Bieber gets zero respect from me. He seemingly acts like a punk 24/7 doing things like spitting on people, attacking people, and throwing eggs at houses and his fans acknowledge that and still try to defend him. If there's anyone who will have a mental breakdown soon, it's probably him.