The real horror of They Came Back is that despite the dead’s mysterious return, they never come back fully, and they are constantly preoccupied with leaving.
Ultimately, I didn't really feel that Pride and Prejudice and Zombies really brought all that much to the table beyond the novelty of its source material.
The Final Chapter uses a darker palate with heavier shadows, more jump scares (seriously, a shit ton of jump scares), and a more frenetic editing style that usually undercuts the impact of the action scenes.
The storytelling is lean and economical, with the visuals giving you all the information you need to see what's going on psychologically with our main character.
It's incredibly refreshing to see some animatronic zombie beavers alongside some half-naked (and sometimes naked) young ladies covered in liberal amounts of blood and gore.