Church vs Factorie

What are the pros and cons of Church (http://projects.csail.mit.edu/church) and Factorie (http://code.google.com/p/factorie)? I'm interested in a comparison based on the following aspects:

• Ease of use
• Stability
• Versatility in terms of the range of models that can be implemented
• Scalability in terms of computational resources
• Availability of inference methods
• Availability of estimation methods
• Possibility of learning the model structure