I'd say custom octo because of the better cameras you can mount and dual battery setups. Those things are so expensive though. In regards to the Inspire being better for professional use, I would agree with this statement if utilizing the dual remote setup to individually control the camera. However, I have heard from most professionals that the I1 is more visually striking to the customer which in turn allows them to charge more for their services than say, they were shooting with a P3P.