Which is the best ORM tool available for Android?

I am seeing ORMlite and ActiveAndroid are the most discussed across and a friend of mine suggested me to use GreenDAO. So looking for some knowledge resource which can help me in Decision Making?

Features I am looking to judge are freely available (open source), good documentation, active forums, stable version available, etc, which ever required for developer.

android ormlite greendao activeandroid droidparts
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