I rather like Maddie's single, though I wish it sounded a little less produced. It reminds me a bit of Phillip Phillips' song "Home" - so maybe that's a good thing?
I think I would've liked Gabby's song better if someone else sang it. It's a weird mashup of country/gospel with some pop-ish Ariane Grande undertones. Gabby doesn't have a strong musical identity to me anyways so I couldn't say if it's a good fit or not.
Caleb's song is just meh to me, sounds like a lot of other generic country songs(and I do actually like country!)