When it comes to media, I have burned literally thousands of DVDs (and a few blurays and hundreds of CDs) and NOTHING beats RiData when it comes to not making coasters. Also, they are not the cheapest, nor the most expensive; just right down the middle... but I have had WAAAAAY fewer issues with RiData.
IF you have the option, dual layer is the way to go, but it is more expensive.