I guess its all a matter of prefrence, I'd go for the least expensive.
I got a bunch of +r's free after rebate, and theyre cheap no name ones and I havent made a coaster yet, knock on wood.The quality is great.
Havent played much with -r's so I couldnt say either way.The one I did try worked well with data, but wouldnt burn a movie.
With all due respect John, I am the head of IT and I have it on good authority. If you type "Google" into Google, you can break the Internet. So please, no one try it, even for a joke.........It's not a laughing matter. You can break the Internet.