what is the difference(benifits) between using sling model and Model creating using WCMUSE?

Question

What is the difference between creating

@Model(adaptables = Resource.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class MyModel {  }

and

public class MyModel extends WCMUsePojo { }

Answer 1

This is pretty well covered in the Sling documentation and the main advantages are:

• convenient injection annotations for data retrieval
• easy to extend from other Sling Models
• simple setup for unit testing

The drawback highlighted in the documentation (lacks flexibility in terms of component overlaying, relying on service.ranking configurations) is being tackled by SLING-5992 which allows mapping a certain model implementation to a resource type.