Both the Pioneer A05 and the Sony DRU-500A work perfectly for creating PS2 DVD backups.
The Pioneer will only create DVD-R, whereas the Sony will do both DVD-R and DVD+R
If you want to create backups of your PS2 games, and want to use DVD+R, it depends on what model machine you have. Anything pre v5 and your laser may struggle to read this format. If you are unsure of what machine you have there is a list
here 