Printing a document or exporting it as a PDF File is technically almost the same.
You can choose what to include into the printout (the comment or the notes for example) and the scope of the printed document - is it only the currently selected one or all arranged texts in a Quick Group to print a complete Book for example. Because myTexts pro differentiates between the screen font and the font for print and export, you can apply your own font and the font size in the Preferences.
When using Markdown you can even print formatted documents and if needed, you can also enable to print page numbers and a custom footer…
How to print a document
Use Menu > File > Print…
How to export a document as PDF file
Use Menu > File > Export As PDF File…