At first sight, XPS and PDF files are very similar in terms of size and features. They are both able to store documents including images, text, tables, charts and other types of fixed design page features. They are both difficult to modify, so they are useful for archiving various files which need a non-editable format in any business — invoices, memos, reports, contracts, books.
However, many users find there are some advantages of one format over the other.