Comparison of LINQ to XM and the Open XML SDK Strongly Typed OM

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LINQ to XML code is highlighted in yellow.  Open XML SDK strongly typed object model is highlighted in green.

using System;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
 
public static class MyExtensions
{
    public static XDocument GetXDocument(this OpenXmlPart part)
    {
        XDocument xdoc = part.Annotation<XDocument>();
        if (xdoc != null)
            return xdoc;
        using (StreamReader streamReader = new StreamReader(part.GetStream()))
            xdoc = XDocument.Load(XmlReader.Create(streamReader));
        part.AddAnnotation(xdoc);
        return xdoc;
    }
}
 
class Program
{
    static void LinqToXml()
    {
        const string filename = "Test.docx";
 
        using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(filename, true))
        {
            XNamespace w =
              "http://schemas.openxmlformats.org/wordprocessingml/2006/main";
 
            MainDocumentPart mainPart = wordDoc.MainDocumentPart;
            StyleDefinitionsPart styleDefinitionsPart = mainPart.StyleDefinitionsPart;
            XDocument mainPartXDocument = mainPart.GetXDocument();
            int paragraphs = mainPartXDocument.Descendants(w + "p").Count();
            int distinctStyles = mainPartXDocument
                .Descendants(w + "p")
                .Select(p => (string)p
                        .Elements(w + "pPr")
                        .Elements(w + "pStyle")
                        .Attributes(w + "val")
                        .FirstOrDefault())
                .Distinct()
                .Count();
 
            Console.WriteLine("The main document part has {0} paragraphs.",
                paragraphs);
            Console.WriteLine("There are {0} distinct styles used", distinctStyles);
        }
    }
 
    static void OpenXmlSdk()
    {
        const string filename = "Test.docx";
 
        using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(filename, true))
        {
            MainDocumentPart mainPart = wordDoc.MainDocumentPart;
            StyleDefinitionsPart styleDefinitionsPart = mainPart.StyleDefinitionsPart;
 
            int paragraphs = mainPart.RootElement.Descendants<Paragraph>().Count();
 
            int distinctStyles = mainPart
                .Document
                .Descendants<Paragraph>()
                .Select(p =>
                {
                    string styleName = "";
                    var pp = p.GetFirstChild<ParagraphProperties>();
                    if (pp != null)
                    {
                        if (pp.ParagraphStyleId != null)
                            styleName = pp.ParagraphStyleId.Val;
                    }
                    return styleName;
                })
                .Distinct()
                .Count();
 
            Console.WriteLine("The main document part has {0} paragraphs.",
                paragraphs);
            Console.WriteLine("There are {0} distinct styles used", distinctStyles);
        }
    }
    static void Main(string[] args)
    {
        LinqToXml();
        OpenXmlSdk();
    }
}