Should I buy DVD-R or DVD+R

It’s for ps2 backup.
I have Sony DRU-510a

I heard that dvd+r dont work on the ps2, is that true?

I dunno about games, but my roommate’s PS2 played my movies backed up on Taiyo Yuden dvd+R flawlessly.
Go to www.rima.com, email them and request a sample of their Taiyo Yuden media. They should send you one 8x+r and one 8x-r.