i like the phm book and movie in different ways for different reasons but one but thing i think the movie was missing that made the book better was the scene between stratt and grace where they're talking about the hard decision of whether to put the astronauts into comas (which would drastically lower their available options for astronauts, since only a very small percentage of people have the coma-resistant gene they'd need) or risk the best candidates being awake and getting cabin fever on the way to tau ceti.
because, IMO, it's an INCREDIBLY nuanced scene, and it sets up an interesting dynamic between the two of them that isn't quite there in the movie.
the way the scene goes is that stratt is having a bit of a crisis about which of these two bad options to choose, and grace sits with her and essentially gives her permission to pick the option she already thinks is the right one, despite the fact that it's still a terrible option. stratt is there to make the hard decisions, to do things that people don't want because it's what humanity NEEDS, but this is the first (and only) time we see her falter in her ruthlessness.
which, on it's own, is INCREDIBLY profound. stratt was chosen to do this for a reason, and aside from this she is INCREDIBLY effective. there's only one other time i can think of where she didn't get things exactly her way, and that was the prison scene (and, of course, she still got what she wanted by the end). but this conversation, this moment, this choice... it rattles her in a way we hadn't yet seen, and don't see ever again.
so the stratt characterization is already so incredibly neat. but then there's also the way that, because of this choice, because of the fact that she chooses to put the astronauts to sleep for the trip, she sets up the dominoes that lead DIRECTLY to grace being the best choice to send to space, even against his will. because grace has the right genes. because grace has become her number two, and has risen to every challenge yet far. because, in her moment of weakness, grace gave her the strength and the PERMISSION to do exactly what she thinks is best. and, lo and behold, however many chapters later, what she thinks is best is to send grace out to tau ceti.
it's just... it's such an interesting detail. the fact that grace is betrayed by stratt in exactly the way he permitted her to do. the one moment when eva stratt might have had made a different choice, might have been slightly less ruthless or domineering or sure of herself, grace says no, actually, you know what you have to do and you're going to do it. and so she does. she does it, just as she later betrays grace, and, in doing so, becomes the catalyst for grace to save the human race.
just.... damn. the layers there, man.
i would have loved to see that in the movie.