Well, I think personality-wise, these three are all a little weak. Haley can be a little off-putting with her poor me act, and I prefer to listen to her without watching her. She sounds really, really great most of the time, but is not my favorite to watch.
Lauren sings great on some things, but has a lot to learn, and her self confidence is sometimes missing when it's needed and sometimes too much there when it's innappropriate, haha.
Scotty is pretty boring, he doesn't really have any facial expressions other than his no expression mr cool look or a smirky smile. His act comes across as playing at being a country singer, he's exaggerating affectations that a country singer would do, it doesn't come across as being from the heart. Of course, he's young, he has a lot of room to mature. I would never buy that style of music, but I can appreciate some people that are good at it like Carrie Underwood or Garth Brooks. Scotty has a long road to get to that level of performance, or he can always just appeal to little girls and grandmas and he'll do fine, anyway, haha.
This isn't a talent show, it's who can get the most votes, so Scotty will win this thing without a doubt.