C#: Spinwait в поле int (действующее как bool) против SpinLock?

Question

В чем эти два различия?

public class SpinWaitLocking
{
    private int _isLock;

    public void TestMethod1()
    {
        var sw = new SpinWait();
        while (Interlocked.CompareExchange(ref _isLock, 1, 0) == 0)
        {
            sw.SpinOnce();
        }

        DoSomethingQuick1();
        _isLock = 0;
    }

    public void TestMethod2()
    {
        var sw = new SpinWait();
        while (Interlocked.CompareExchange(ref _isLock, 1, 0) == 0)
        {
            sw.SpinOnce();
        }

        DoSomethingQuick2();
        _isLock = 0;
    }
}


public class SpinLocking
{
    private SpinLock _spinLock = new SpinLock();
    private bool _isLock;

    public void TestMethod1()
    {
        _spinLock.Enter(ref _isLock);

        DoSomethingQuick1();

        _spinLock.Exit();
    }

    public void TestMethod2()
    {
        _spinLock.Enter(ref _isLock);

        DoSomethingQuick2();

        _spinLock.Exit();
    }
}