here are the two empires at their height:
Persian: http://www.cais-soas.com/CAIS/Images2/Maps/Achaemenid_Empire_Map.bmp
Roman: http://www.dkimages.com/discoverpreviews796379533.JPG
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Persian: http://www.cais-soas.com/CAIS/Images2/Maps/Achaemenid_Empire_Map.bmp
Roman: http://www.dkimages.com/discoverpreviews796379533.JPG
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The Persian Empire is greatest in area. Whether it was bigger depends on what criteria you want to measure the two against – population, wealth etc.