Are Adidas Supernova Trail stablity or nuetral ?

Stability.

Are you saying that because all trail shoes are stablity or because it has a stability bar in its shoe ?

If I like the Supernova Trail do you think I can expect the same from the Supernova Classic ??

The Supernova Trail has a firmer medial post, so most would categorize it as a stability shoe. The only thing that makes it slightly less stable is that the foundation (last) is fairly narrow.

Thanks, Does the Supernova Classic have a narrow foundation ?