I think they give entirely different feels, with the US cover more epic fantasy and the UK one more lighthearted. Personally, I like the US version with its simplicity and the subtle texture in the background, and the darker mood overall. While it seems to lean a bit toward adult covers, I actually like how the girl and the horse are just silhouettes, since faces and half-bodies on covers are a-dime-a-dozen (they're pretty but...). But, in the end, I just LOVE Maggie Stiefvater's lyrical prose and WANT WANT WANT.
Here's the short blurb on The Scorpio Races (releases October 18th):
"With her trademark lyricism, Maggie Stiefvater turns to a new world, where a pair are swept up in a daring, dangerous race across a cliff--with more than just their lives at stake should they lose".
• Review and giveaway of OyMG coming in a couple hours because Blogger went down - and deleted all my edits to my review, grr.
• Leah Cypess week is coming next week! And so you see the banner I made for it up there. :D