There are several editions of Bennett's Virtues books. If it helps you choose from among the editions, here's the deal.
This edition, The Book of Virtues for Young People, is intended for children 9-12 and is 384 pages long. It contains familiar childhood stories such as The Fox and The Crow, but also selections by beloved writers such as Walt Whitman, Tolstoy and Emily Dickinson.
The Book of Virtues for Boys and Girls: A Treasury of Great Moral Stories is also intended for children ages 9-12, but it is an abbreviated version of only 208 pages.
The Children's Book of Virtues is intended for children ages 4-8 and is only 112 pages. The stories are chosen for their appropriateness for this young audience (many reviewers mention their dislike of some of the stories in other versions) and include familiar childhood stories such as George Washington and the Cherry Tree and The Tortoise and the Hare.
I thought I was going to buy the one for Boys and Girls, because the cover shows children playing baseball and the introduction is by Doug Flutie and would appeal to my sports-mad son. But in the end, I wanted more choice of stories, and that version just didn't have enough variety. As in all the books, the stories are grouped by theme (Honesty, Loyalty, Faith, Responsibility, etc.), and the Boys and Girls book has only five themes to choose from, half as many as the adult version.
Ultimately, I chose the adult version, The Book of Virtues, because my son is aging out of the younger audiences.
If you want just inspiring stories of real and fictional heroes, Bennett has also collected such stories in The Children's Book of Heroes, which is a brief book as well, just 112 pages and containing 18 stories. And, The Children's Treasury of Virtues combines three of Bennett's books, The Children's Book of America (patriotic stories, songs and poems), The Children's Book of Virtues and The Children's Book of Heroes.
Hope this helps!