Many power users stick with version 9.5.366.0 because it introduced several specific quality-of-life updates that made high-volume work much easier: PDF-XChange Products Comparison Chart
About Product Bundles: PDF-XChange Pro is a bundle product that contains a license for PDF-XChange Editor Plus, PDF-Tools and PDF- PDF-XChange PDF-XChange Editor Plus pdf-xchange-editor-plus-9-5-366-0-full-version
Use JavaScript to create stamps that automatically update with the current date or specific user info. Many power users stick with version 9
Quickly side-by-side two PDFs to spot every tiny change, insertion, or deletion. Why Users Love Build 9.5.366.0 pdf-xchange-editor-plus-9-5-366-0-full-version