Melanie Martinez still has my vote to win by a mile. Cassadee hasn't sounded that great on any of her songs, really. Though I love ATL, their fans are honestly probably the only thing keeping her afloat at this point. And quit with the damn fake guitar, almost everyone knows the contestants barely ever actually play them.
Just throwing this out there, but Melanie has by far and long the weakest voice in the competition. Sure her tone is unique and cool, but she always goes quiet for the high notes and usually plays it pretty safe; paired with the fact she didn't get enough votes to get into the next live round and had to be saved by Adam, I have a feeling she won't be around too much longer.