This latter story, by Peter Beagle, was my favorite. It was a super-hero book that was fit for publication in The New Yorker. I will definitely pick up his other work in the future.
Lawrence Block's thriller was also satisfying as was David Weber's story about an alien invasion of Earth. Normally I dislike David Weber's military sci-fi, but his novella of humans fighting back was too much fun. Spoiler alert: it had vampires!
I could spend all day reviewing each story in Warriors. Suffice it to say I will be purchasing this book the moment I find it at a used bookstore.