Saga has already won the Best Graphic Story Hugo once, in 2013, for the first volume of the series. I think the review I did of that first volume back then also goes for the third volume:
What makes Saga more than just a pretty sci-fi adventure is the simple fact that none of the main characters are true villains or heroes. Alana and Marko just want to live in peace with their daughter, to be left alone, while Prince Robot IV just want to get things over with so he can go home to his pregnant wife. Even the two freelancers are anything but Boba Fett like bounty hunters, with The Will frex having confliced feelings about his former partner, The Stalk.
But what really makes the series is the artwork; as said Staples is seriously good at facial expressions, slightly exaggerated at key moments, but also has a good eye for character design and layout in general. In general, like Prophet, this is a series that actually makes me enthusiastic about American comics again, something that shows there are still pleasant surprises to be had.
The only thing worth adding to this is that being the third volume, this is less of a complete story than the first, starting and ending in media res. I went back and forth on whether this or Ms. Marvel was the better comic, but though Saga is more properly science fiction, Ms. Marvel was done slightly better and perhaps the more important comic.