US // UK
This is a difficult one for me, 'cause I actually like both these covers. I'll admit the UK one is a lot nicer in person - but it has a great design and never failed to stand out on the store shelves. I think it really shows the horror element of the book, and I love the tagline at the bottom: 'They'll chase you. They'll rip you open. They'll feed on you...' Cool, eh?
I don't know what the new US cover looks like in person, but I'm sure it's just as nice. I much prefer the title font on this one, and I like that it's slanted - it makes me feel a bit uneasy. Whichever cover you own, watch out when you're reading at night... I've heard stories from my friends who couldn't sleep afterwards!