In my opinion in case of Entity Beans our bean only work under contanier. means you cant reuse those object outside container. There is no concept of Detached Objects. But in case of hibernate we have detached object concepts.

EJB3 and Hibernate both support JPA. Advantage of Hibernate over EJB3 Entity
are as follows;

EJB3 Entity needs a container to run where as Hibernator does not need one.

Hibernate support Java annotations as well as Hibernate annotation which has
more fractures where as EJB3 entity does not support Hibernate annotations