I think Lauren is my favourite at the moment. She has more 'spark' than the other 'outsiders'.
However, has she confronted and taken on the HMs who are being nasty about her? If not, I think she needs something like that to give her a 'winner's story'. And if, instead, she has done that, I don't think it's widely enough known. She did ask the girls what their problem with her was, a while back, but the impact of that was weakened by her desire to be friends with them.
Feel free to disagree with what I said about and to tell me I've got it wrong (if I have). That's just how it seems to me as someone who likes Lauren but hasn't followed her BB story very closely.