About 3 years ago I bought "Sushi for Dummies" and used it as a guide to many successful sushi dinners. It is a great book and goes into much detail.
Recently I wanted to start making sushi again and have bought a few more books. I bought the Sushi Cookbook and upon reading it, I see how much detail it leaves out. The book has lots of nice photos, but glosses over almost every topic. I was quite surprised.
If you are a first timer and want a lot of great tips, I feel Sushi for Dummies is much more useful. There are less pretty photos in Sushi for Dummies, but the information is far more helpful.