Recently I replaced neenbedankt annotation processing library with google Support-Annotation library, and change all apt methods in build.gradle with annotationProcessor and every thing works good, My question is what is the difference between them and when should we use each of them?
There is no difference. annotationProcessor is the new feature of gradle plugin.
More info from the creator of android-apt here
The main conclusion from this article is that annotationProcessor is doing the same as android-apt and that is why android-apt is no longer maintained. You are advised to use annotationProcessor