Which DVD burner is better for PS2, -r or +r?

[crasshh]

I have a PS2 and looking to buy a dvd burner. Which burner would be better for backing up my PS2 Discs a DVD-r or a DVD+r. Most of the post have people stating they have a -r is this more reliable for Backing up PS2 DVD's?

Also, which blank dvd's for the PS2 are more relaible, verbatim, or ritek?