I don't really dislike any of them, but if I had to choose it would be Miley. I like some of her music, but I think she contradicts herself too often and comes across as too try-hard sometimes. She is definitely talented, though.
Everyone loves more than 1 song by Xtina, and that makes ya'll at least like her as an artist at the very least. So anyone who voted for her's a liar. Anyways my answer's Gaga.