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

[Headly]

I heard somewhere that if you have one of the later versions it would actually be better to have a +R burner. I remeber them saying that +R had a higher reflectivity and thus will not stress the laser so much. Can anyone back this up. I never looked into it due to the fact that I have a +R burner that has worked great for me so far. Even works awesome in my Bros PS2 v1 that had a new laser put in. Needed a little tweek to start with, but has done well since.