There aren't many versions of the camera itself, it's the accessories and fitments that come with them that differ.
I got the Surf Hero as bizarrely it was cheaper than the others, then picked up the Motorsport accessories separately. Exactly the same camera!
The Motorsport kit is superb btw...the clamp is really strong, you could literally swing off of it.
Here's a quick test vid I took last year:
Must get out with it again soon!