Systems that actualy emulate Western movies?

[Aldarc]

Sergio Leone's depiction of violence is similar to the kind you find in tales such as the odyssey, it's meant to emphasize the exploits of larger than life heroes, violence here can have beauty in it, it's a spectacle just like with the gladiators of ancient rome. Sam Peckinpah's violence is meant to hammer in the fact that the world is an awful and terrible place; violence here is absurd, ugly and meaningless.

None of them depicts violence in a realistic way.

I'm not sure if I agree with this assessment. At the time, Sergio Leone's depictions of violence were very much seen in light of what you describe for Peckinpah's films, particularly in contrast with the sort of John Ford Westerns or the Westerns with the Elmer Bernstein scores.

 

[HellfireVanWinkle]

The opinion of people is of no importance, because fact here remains that violence in Leone's cinema is romanticized in a spectacular manner, typically the duels with the count to three never happens with Peckinpah's because pretty much every american director of the time thought it was silly. But Leone made it a staple of the genre because rule of cool eventually made it popular.