What C# naming conventions should be used in Unity 2

// The Unity way
public class BadHero {
    private int m_Health { get; set; }
    public BadHero(int health) {
        m_Health = health;
    }
}

// The C# convention
public class GoodHero {
    private int _health { get; set; }
    public GoodHero(int health) {
        _health = health;
    }
}