Simple 2 string anagram check in C#

Anagram.cs

void Main()
{
    Func<string, string, bool> anagram = (first, second) =>
    {
        if (first == null || second == null) return false;
        if (first.Length != second.Length) return false;
        return first.OrderBy(x => x).SequenceEqual(second.OrderBy(x => x));
    };

    Func<string, string, bool> anagram2 = (first, second) =>
    {
        if (first == null || second == null) return false;
        if (first?.Length != second?.Length) return false;
        return first?.OrderBy(x => x)?.SequenceEqual(second?.OrderBy(x => x)) ?? false; // ```?? false``` can be ```== true```
    };

    var sw = Stopwatch.StartNew();
    foreach (var item in Enumerable.Range(0, 100000))
    {
        anagram(" ", " ");
        anagram("1", "1");
        anagram("eros", "rose");
        anagram("eros", "lose");
        anagram("", "rose");
        anagram("eros", "rosesssss");
        anagram("bab", "aba");
        anagram(" ", "  ");
        anagram(null, null);
        anagram(null, "");
        anagram("hoge", null);
        anagram("1", "2");
    }
    sw.Stop();
    $"{sw.Elapsed.TotalMilliseconds}ms".Dump("Sequence");

    Debug.Assert(anagram("", "").Dump());
    Debug.Assert(anagram(" ", " ").Dump());
    Debug.Assert(anagram("1", "1").Dump());
    Debug.Assert(anagram("eros", "rose").Dump());
    Debug.Assert(anagram("eros", "lose").Dump() == false);
    Debug.Assert(anagram("", "rose").Dump() == false);
    Debug.Assert(anagram("eros", "rosesssss").Dump() == false);
    Debug.Assert(anagram("bab", "aba").Dump() == false);
    Debug.Assert(anagram(" ", "  ").Dump() == false);
    Debug.Assert(anagram(null, null).Dump() == false);
    Debug.Assert(anagram(null, "").Dump() == false);
    Debug.Assert(anagram("hoge", null).Dump() == false);
    Debug.Assert(anagram("1", "2").Dump() == false);

    sw.Restart();
    foreach (var item in Enumerable.Range(0, 100000))
    {
        anagram2(" ", " ");
        anagram2("1", "1");
        anagram2("eros", "rose");
        anagram2("eros", "lose");
        anagram2("", "rose");
        anagram2("eros", "rosesssss");
        anagram2("bab", "aba");
        anagram2(" ", "  ");
        anagram2(null, null);
        anagram2(null, "");
        anagram2("hoge", null);
        anagram2("1", "2");
    }
    sw.Stop();
    $"{sw.Elapsed.TotalMilliseconds}ms".Dump("Sequence ?.");
   
    Debug.Assert(anagram2("", "").Dump());
    Debug.Assert(anagram2(" ", " ").Dump());
    Debug.Assert(anagram2("1", "1").Dump());
    Debug.Assert(anagram2("eros", "rose").Dump());
    Debug.Assert(anagram2("eros", "lose").Dump() == false);
    Debug.Assert(anagram2("", "rose").Dump() == false);
    Debug.Assert(anagram2("eros", "rosesssss").Dump() == false);
    Debug.Assert(anagram2("bab", "aba").Dump() == false);
    Debug.Assert(anagram2(" ", "  ").Dump() == false);
    Debug.Assert(anagram2(null, null).Dump() == false);
    Debug.Assert(anagram2(null, "").Dump() == false);
    Debug.Assert(anagram2("hoge", null).Dump() == false);
    Debug.Assert(anagram2("1", "2").Dump() == false);
}