Singleton vs MonoSingleton

Singleton.cs

public abstract class Singleton<T> where T : Singleton<T>
{
        private static T s_instance = null;

        public static T Instance
        {
            get
            {
                if (s_instance == null)
                {
                    LogUtil.Log (LogUtil.SectionFlags.Verbose, "");
                    s_instance = Activator.CreateInstance<T>();
                    s_instance.Init();
                }

                return s_instance;
            }
        }

        virtual public void Init ()
        {
        }

        virtual public void UnInit()
        {
            
        }

        public static bool HasInstance ()
        {
            return s_instance != null;
        }

        public static void DestroyInstance()
        {
            if (HasInstance())
            {
                s_instance.UnInit();
                s_instance = null;
            }
        }
    }

MonoSingleton.cs

public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
{
        private static T m_instance = null;

        public static T Instance
        {
            get
            {
                if (m_instance == null)
                {
                    LogUtil.Log (LogUtil.SectionFlags.Verbose, "");
                    m_instance = GameObject.FindObjectOfType (typeof (T)) as T;
                    if (m_instance == null)
                    {
                        m_instance = new GameObject ("_Instance of " + typeof (T), typeof (T)).GetComponent<T> ();
                        DontDestroyOnLoad (m_instance);
                    }
                    m_instance.Init ();
                }

                return m_instance;
            }
        }

        virtual public void Init ()
        {
        }

        protected void OnApplicationQuit ()
        {
            GameObject.Destroy (m_instance);
            m_instance = null;
        }

        public static bool HasInstance ()
        {
            return m_instance != null;
        }
}