Sling Models vs WCMUsePojo

WCMUsePojo	Sling Models
Pure POJO’s(Plain Old Java Objects)	Annotation driven POJO’s. The class uses @Model annotation & fields use the @Inject annotation
No default resource mapping	Sling Models are mapped automatically with Sling Objects (resource, request objects..) and allow us to access jcr node property values directly into java classes. For Example: @Inject @Named("sling:resourceType") protected String resourceType;
Always extends from WCMUsePojo class	Can be standalone class with @Model annotation
Supports only Classes	Support both classes and interfaces.
Overrides activate() method	init() method is invoked in @PostConstruct annotation
@Reference to reference an OSGi service	@Inject or @OSGiService annotation used
No Exporter available by default	@Exporter annotation can serialize the model and export it as a JSON file with Jackson exporter

References:

• The Use-API - https://sling.apache.org/documentation/bundles/scripting/scripting-htl.html#the-use-api