keep in mind that "Most" newer players will play either + or -. However, if you don't burn them properly it doesn't matter what type you have. I have been burning dvd's for a few years now, and have seen the - r to be more compatible. I have also read that +r bitset to - rom are more compatible, and I have seen this once. I also have seen a set-top dvd player at my sister's that would play some of the disc's, and then pixelate through anything after about 20 minutes. Then a year later, and I am only burning 8x disc's (probably better quality also), and her player plays the discs just fine. I have seen this with the dvd player in the mini-van also. So as with older players the rule might best be summed up with: bitset + r's first then -r's after that, then +r's last. Most older players will not touch any rw disc. With newer players they will play + and - almost equally, and some will play a +rw, and some will play a - rw. I have NEVER seen a set top player that plays a + but won't play a -. I have seen quite a few times players that won't touch a + but will play a -.. BUT most important is the burn method, and the media. I have used a video program to burn a disc that won't play in some players, and I took the same files, and made an image with DVD Shrink, and burned it with Decrypter and it would play just fine. Good luck and don't forget to check out the set top player compatibility over at www.dvdhelp.com
Hope this helps.