The best replacement for xdocument is xelement.

The best alternatives to xdocument are rated as following:
★★★★★  xelement
★★★★★  xmldocument
★★★★  xmlreader
★★★  xmldocument performance
★★★  xmlwriter
★  xelement c#

Your alternative for xdocument is not listed? Suggest!
Speaking about xdocument, one probably shouldn't forget about xpath.

Other search terms related to xdocument and their ratings are:
★★★★★ xpath
You have in mind a companion for xdocument and it is not yet here? Propose!



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xdocument
xelement
xmldocument