One issue I have with a number of the libraries that I've used is that they require that their initialization take place in android.app.Application.onCreate(). I prefer that libraries allow me to do their initialization in a secondary thread, in a service, or after I have finished displaying the user interface.
I believe that Active Android has this 'problem', and ORMLite does not. I'm not sure about GreenDAO.
Whether it is really a problem depends on your application, but I will note that the docs for onCreate() say "Implementations should be as quick as possible (for example using lazy initialization of state) since the time spent in this function directly impacts the performance of starting the first activity, service, or receiver in a process."
Unrelated to that, I note that ActiveAndroid uses annotations, like ORMlite, but unlike GreenDAO which uses code generation.
