biggest difference is the slightly larger size of the -R ... occasionally you'll find a release that won't fit on a +R.
I've heard -R has a little bit better compatibility, but with most newer dvd players, I don't think it makes a difference.
asus z170-A || core i5-6600K || geforce gtx 970 4gb || 16gb ddr4 ram || win10 || 1080p led samsung 27"