Two books I really liked from last year just came out in paperback. I'm going to give my (non-artist, non-sales department) opinions and you tell me which you like better.
First case: Zoe Heller's THE BELIEVERS. This cover is based on the British edition and I like it just fine:

But the paperback is definitely an upgrade:

I was scanning the H-shelf at a bookstore and this jumped right out at me. It alludes cleverly to the subject matter -- a family in the '00s of which the parents were '60s radicals -- without being obvious or spoilery. And the book opens in a townhouse much like this one. Is it possible the designer actually
read the book? That's... splendid! (I don't know if they always can or do -- if anyone with insider knowledge wants to chime in...)
Second case: Arthur Phillips' THE SONG IS YOU. The hardcover design is a bit vague but the black-and-white photograph with the blue are pleasant:

And here it is in paperback:

What's so bad about it? Well, I'm still not a fan of the font, but I couldn't help noticing this cover illustration is a slightly altered photo
of Arthur Phillips. I recognized it right away --
see? (Don't know
why I remembered it, but carry on.)
I mean, he must have signed off on it, and I doubt anyone in a bookstore would care. But is this going to be part of the writer's job now as well? Are there not models for that?
Bonus cover: While looking up the UK cover for THE BELIEVERS I spotted the across-the-pond paperback redo for Joseph O'Neill's NETHERLAND, whose derivative design I
wrote about last year. Behold:

Definite upgrade. I know some people find that tilt-shift work unbearably twee, but I am not one of them yet.