[Z]

Rebecca, she's the only one who isn't relying on an image based gimmick, so I think will (by default) have the longest career out of it. She's been consistently good every week unlike the other finalists, and she's gone from strength to strength. She may not be everyone's cup of tea because people perceive her to be boring, but you have to bear in mind that this is only within the confines of the X Factor, post X Factor who knows how she'll be?