I have a Garmin Dash Cam Mini thats always on the bike. It automatically powers up and starts recording when the bike is turned on, and shuts off when the bike is shut off, basically used in case of an accident. I have a JVC Adixxion action cam that most of the time I mount on my helmet whenever I want to record a ride. I prefer it on the helmet for a couple of reasons, it doesnt vibrate with the bike, and its a more stable recording mounted on my helmet. I also like recording what I'm looking at. Whenever I want an unusual shot, I'll mount it in other places on the bike, such as the passenger foot peg shooting forward using this Pedco camera clamp. The clamp gives a lot of mounting options.
I have this. It has been fantastic. I can put the sim card in my Macbook and use iMovie to put all the clips together and make a great video. I am actually considering getting another one and installing it in my new truck