This book is all about comparing persistence frameworks, and we do discuss Hibernate.
Since Entity Beans have fallen out of favor, we discuss Open JPA.
Your question on not too many objects is probably not a Hibernate versus CMP question, but rather SQL Based Framework (iBatis, pureQuery) vs an ORM one (Hibernate, JPA, etc...).
Does your application spend more time/use cases accessing/manipulating data through accessor methods or do you access data more through some query (SQL or Object query)? If your application spends more time accessing data through some query language, maybe a full ORM is not a right solution and
you should look at iBatis or pureQuery.