For YA, I prefer books with emotional growth -- characters who do the right thing, even though it's hard, and then are clearly rewarded for it. Two recent reads which stand out that way: When by Victoria Laurie and Tether by Anna Jarzab. Both are filled with challenges for the heroine, and in both (especially Laurie's), the heroine does what she knows is right, even though she's risking things that truly matter to her.
I like how the authors make it clear what *does* matter to the heroines too...and then, in the end, they are rewarded nicely. (Jarzab's reward isn't as solid as Laurie's, but that's partly because it's the second book in a trilogy...room for more.)