I don't know that engine, but from previous coding experiments on free 3D engine, I know you should really make your decision after really putting your hands on one or several game engines. A really good way to do that is to design a proof of concept and to code it with each of your candidate game engines.
A simple test case could be : import a model, use a configuration file for the scene, put the model in game in the scene and try to control the model, the camera according to some simple rules.
Let us know about your progress in this area. What did you achieve so far ? I asked once about the MotorCity project, I wanted to know if you produced that with only CG software or if some coding were involved. I'll stay tuned for your answer
