I just listened to the OTR versions, and OK I'll be biased and say I thought Danielle's was the best.

Why should that be wrong on an appreciation thread?
Anyway, to be more specific, I liked all three of them, but I did prefer Danielle's because of the acting. The other two were also excellent, though. Sophie's was sweet and girlish, and Lauren's was probably the most vocally powerful, but Danielle had me with the acting. I could hear the wistful emotion in her voice, and she also sounded really good.
I think the fans of each of the girls like their favorite for different reasons, and as you could hear the distinctive qualities of each girl in her version of OTR, I am not surprised that most fans prefer their girl's version, because they are all so distinctively "them".
I'm really getting nervous now. I hope Danielle wins on Saturday, but no matter what happens she will have a great career, as will the other two.