I liked both stories, mainly because of their streamlined nature. I don't mind long stories, but Stephen King does have a tendency to ramble in many of his stories, obsessing on trivial details. Both stories were quite 'lean and mean', which was nice.
If I have to choose, I definitely prefer Blockade Billy of the two. I'm not even into baseball, but I found it very engrossing, never losing your attention. I've known people like Billy (aside from the worst parts....I hope), and King really nails his personality and voice (or lack thereof). I also love the cover. At first it seems innocent, but then I started reading, and found myself flipping back to the cover, to get a better look at Billy. Delightfully creepy story + cover.
Morality was nice, but nothing new. Drunk author husband + unfaithful (or merely suspected of being so) wife is a recurring theme in many of his books. The story worked well though, again because it was refined. Instead of 300 pages, we have 50ish, which is a good length for the story, given that there are only three important characters.
I highly recommend the book, especially if you can find it in the discount section.