Excel and PDF creation

What to use for excel or PDF generation ?

PDF - Apache PDFbox http://pdfbox.apache.org/

XLS - Java Excel API http://jexcelapi.sourceforge.net/

XML and XLST - Apache FOP http://xmlgraphics.apache.org/fop/

Office - Apache POI http://poi.apache.org/

or use of a reporting engine like BIRT or OpenReports