It was clear to me which guy, Gabriel or Linden, Rhine was supposed to choose, and, yet, I never really felt the relationship between them was any stronger than with that of the other. 
 Where the true strength in relationships lie is between Rhine and her sister wives. I think the relationship between them has the same sort of draw that something like The Bachelor has, only without the insipidness of being "reality tv" but instead surrounded by beautiful prose and a dystopian plot. You see them compete in one way or another for the attention of their husband, even when some of that competition is simply part of a plot to get something else. For Rhine, the attention that she wants is a means to an end: her freedom. But despite the three girls' differing views on their marriage, they have their own relationship that is part-friendship, part-sibling, and part-competition. 
 One last note is about the villain of the novel. Housemaster Vaughn is creepy enough when he's onstage, but he seemed just kind of stereo typically villainous to me. While some of his actions are explained away as wanting a cure for his son, other actions just seem to be him exerting control over everyone just for the sake of making him seem creepier. 
 Overall, though, I recommend Wither to people who like Utopians, relationships between girls, The Bachelor, or creepy villains in claustrophobic but colorful settings.