WcmUsePojo Vs Sling Models

There is no the best solution for that. It depends on many various things smacdonald2008​ wrote already (with massive exhausing explanation). Although tldr: using Sling Models coexist with using a lot of annotations (like JPA a little, at least for me) and Use classes are rather manual processing from a resource to specific class. Moreover, and forgive my ignorance, Sling Models are using (100% sure) adaptTo method and I am not sure which mechanism Use classes are using (I think its some injections during HTL but I might be wrong). Personally I have got away from Use classes in favour of Sling Models but it was related to that I need mostly plain classes without any processing so essentially few fields with annotations and getters are doing their job well.