Should I export with ReportExportControl.processHttpRequest OR Java I/O libraries to write result the browser ?

Question

Hi All,
In our web deployment using JRC, we export to PDF on browser.
There are two approach so far to achieve that  (codes attached below) :
(1) Use ReportExportControl.processHttpRequest
(2) Use the Java I/O libraries to write the exported result the browser
The question is :
Which one will take less bandwidth requirement / more efficient ?
Or , is it just the same ?
Thank you very much,
xtanto
The Codes :
1) Use ReportExportControl.processHttpRequest
ExportOptions oExportOptions = new ExportOptions();
            oExportOptions.setExportFormatType(ReportExportFormat.PDF);       
            ReportExportControl oReportExportControl = new ReportExportControl();
            oReportExportControl.setExportOptions(oExportOptions);
            oReportExportControl.setExportAsAttachment(false);            oReportExportControl.setReportSource(reportClientDoc.getReportSource());
            oReportExportControl.processHttpRequest(request, response, getServletConfig().getServletContext(), null);
2) Use the Java I/O libraries to write the exported result the browser
ByteArrayInputStream byteArrayInputStream = (ByteArrayInputStream)reportClientDoc.getPrintOutputController().export(ReportExportFormat.PDF);
reportClientDoc.close();
writeToBrowser(byteArrayInputStream, response, "application/pdf", EXPORT_FILE);
From the helper class :
    public static void writeToBrowser(ByteArrayInputStream byteArrayInputStream, HttpServletResponse response, String mimetype, String exportFile) throws Exception {
                    //Create a byte[] the same size as the exported ByteArrayInputStream.
                    byte[] buffer = new byte[byteArrayInputStream.available()];
                    int bytesRead = 0;
                    //Set response headers to indicate mime type and inline file.
                    response.reset();
                    response.setHeader("Content-disposition", "inline;filename=" + exportFile);
                    response.setContentType(mimetype);
                    //Stream the byte array to the client.
                    while((bytesRead = byteArrayInputStream.read(buffer)) != -1) {
                            response.getOutputStream().write(buffer, 0, bytesRead);
                    //Flush and close the output stream.
                    response.getOutputStream().flush();
                    response.getOutputStream().close();

Answer 1

With the JRC, the PDF generation engine would be the same.
One advantage of the PrintOutputController is that it gives you more control over the output - where it goes, how it's streamed out, etc.
(Aside note: for BusinessObjects Enterprise Java SDK, the ReportExportController would be more efficient, since you can specify the Page Server rather than RAS server to create the output.)
Sincerely,
Ted Ueda