Lady Gaga definately, the reasons:
1. she can sing amazing even without her voice being editted.
2. She's more original.
3. She seems more down to earth and fun
4. her music isn't painful to listen to.
Justin's reasons why he sucks
1. He just got famous overnight, never had to work for it, just because his family had connections.
2. He says “baby” too much, now when I hear that word I gag.
3. he can't sing without annoying sound effects/background effects, and/or editting.
4. He sounds like a girl
5. He's not original
6. He sings about the dumbest things.
7. He let his fame ho to his head, he's rude and he's way overrated.
I might add more later. I'm too lazy right now though, this is the second time I had to write this out cuz my internet spazzed and it didn't post the first time.