[adouglas]

Helmet attach is no big deal and will give better results than putting it on your body for the reason already stated.

If your purpose is as a CYA documentation tool, then a tank mount might work better. Not because the view will be better or anything like that, but if you don't make it super-convenient it will soon move from "This is a good idea" to "Why the F do I bother with this crap?"

So you want to make the camera very accessible, very easy to remove and out of the way of everything.

If you anticipate going to the track, heads-up that some organizations do not allow helmet-mounted cameras.