v1-v4 usualy only plays -r if anything. Sometimes a v4 will play +r though. In your case I think -r would play much better in your system. v5 and up usualy plays -r and +r. This is what I meant by the ps2 liking -r better, because more versions support -r over +r. But if you have a v5 and up it doesn't really matter. As far as dvd players go, not by testing the players to see what they play, more players claim to play -r than they do +r. Don't know if you have tried -r media on your ps2 or dvd player, but if you like I can send you a -r backup and you can send me a +r backup(of course of something we already legally own) and we can see how it goes.
Everyone is entitled to their own opinion. I have mine you have yours.