For me, these are the following advantages:
- native - does not require additional components (TfrTNPDFExportFilter requires PowerPDF component) or libraries (TlrCairoExport requires additional libraries to be able to export to PDF)
- supports all characters without any problems - last time I checked, PowerPDF had problems with diacritical characters of other code pages than cp1252 (my native language is Polish, so after export the reports were not complete)
PS. The fix has been added to Lazarus, so in the trunk version the problem is already solved.