Roisin's doing the best in my opinion. She comes up with good ideas which is the type of person you need to invest in. She knows what people will want and puts a lot of thought into it. IMO she also did well in the candles task - in the real world her candles would have been more successful, having had the stronger brand.
Which brings me to the next credible candidate, Katie - she has obviously learnt from previous series that you need to listen carefully to Lord Sugar - she picked up that that candles task was all about margins. In the real world, ripping people off with a massively overpriced crappy candle wouldn't work. But Katie knows how to play the Apprentice game - she listens, she's perceptive, she "gets" what the tasks are about, she knows when to keep her head down and when to speak up, she knows how to disappear without being accused of "not contributing" and who to side with without being accused of "game playing". I therefore conclude that she is very clever, and even though I've not seen too much this series that overtly shows her entrepreneurialism, her real-life success shows she's credible.
I really like Lauren, she's a good candidate IMO because she's NOT playing games. She's clever, she's nice, she doesn't feud, and if she doesn't agree with something she keeps her head down and gets on with it. In the real world, these are good skills, but in Lord Alan's world being an educated professional who is nice and normal rather than ruthless is a cause for great suspicion. Unfortunately I don't think she will win for these reasons.
I really liked Pamela after seeing her on You're Fired - I think she had a bad edit. Her dyslexia consultancy idea was good - I know someone who has recently started up a similar project to train organisations about Asperger syndrome, and it is shaping up to be successful. Because such things will usually ultimately be paid for by the Government, she won't have to worry about the fickle public. I really felt for her when her stammer came back when mentioning her experience at school - it was obviously emotional for her and she clearly cares about her idea. I wish her the best of luck, not least because people with dyslexia are lacking in help and support.
Solomon has good ideas and is a lovely boy, but I think he may be slightly immature/inexperienced and may have been more successful if he was a few years older. I don't have much of an opinion about him yet tbh, we'll see how he gets on in weeks to come.