I've never really shot anything that required "Action Camera" so I really have no opinion on those things. As per my previous post I tend not to get into recommending hardware or software because a) there's so much of it out there and b) I figure most fanfilm makers are low- or no-budget and are going to use whatever they have at hand or can get their hands on. The gear I've used is all over the place. I did the film Afterglow to see what I could do with a smartphone and a gimbal and a cheap FLIR thermographic camera accessory for the smartphone. I shot one Kinsey Sicks video using three smartphones and a Canon T4i. I've shot a lot of videos with the same Canon, I've had DPs bring their own cameras in on other shoots.