I have VP13 and plan to upgrade to VP15 once things settle down. I own Hit Film Pro 4 which includes Mocha, although I am yet to use it in any serious fashion. Mocha have just released a new version.
So here is my question. I prefer to work 'within' Vegas where possible with plugins being invoked from the timeline and the resultant changes being replaced on the timeline. For Mocha planar tracking, would other users recommend the Hitfilm, BCC or standalone Mocha path?