PHP Excel (PHP Class) กับ PHP Excel (Excel.Application) ต่างกันยังไงหรอคะ

<?php
	//*** Get Document Path ***//
	$strPath = "C:/AppServ/www/testJquery"; // C:/AppServ/www/myphp
	$OpenFile = "file/ส่งองการ.xlsx";
        $OpenFile = iconv('UTF-8','windows-874',$OpenFile);
	//*** Create Exce.Application ***//
	$xlApp = new COM("Excel.Application");
	//$xlBook = $xlApp->Workbooks->Open($strPath."/".$OpenFile);
	$xlBook = $xlApp->Workbooks->Open(realpath($OpenFile));

	$xlSheet1 = $xlBook->Worksheets(1);		
?>
	<table width="420" border="1">
	<?php for($i=1;$i<=7;$i++){?>
	  <tr>
		<td><?php echo $xlSheet1->Cells->Item($i,1);?></td>
		<td><?php echo $xlSheet1->Cells->Item($i,2);?></td>
		<td><?php echo $xlSheet1->Cells->Item($i,3);?></td>
		<td><?php echo $xlSheet1->Cells->Item($i,4);?></td>
                <td><?php echo $xlSheet1->Cells->Item($i,5);?></td>
                <td><?php echo $xlSheet1->Cells->Item($i,6);?></td>
	  </tr>
	<?php }?>
	</table>
<?php	
	//*** Close & Quit ***//
	$xlApp->Application->Quit();
	$xlApp = null;
	$xlBook = null;
	$xlSheet1 = null;
?>