Im an early adopter and gear slut....
![Oops! :oops: :oops:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f633.png)
Gp4 black, if used primarily in the vehicle for dash cam purposes is overkill. If you do like the hero form factor and brand, get the "hero" model. I use gopro only for television and cinematic productions.
That said, until I get the x2, I'm using one of the older gopro cams in the car just for grins (so I can see how four cams can be utilized in the ride...)
Don't know the a9 was in there!!! I am on that same site as much as this one. That's very cool!
Based on the specs, experience with the pano g and
@niko reviews, I think the x2 is the cam to get.