I could go into detail but your question really doesn’t require an explanation of the types of media. Basically, I would buy which ever format that your DVD player plays or is going to play the burned film.

Actually most Lite-On drives can "bit-set" a DVD+R disk so a player thinks it is a pressed DVD, in my opinion these are even more compatible than non bit-set DVD-Rs.

Currently you have to look around a bit to find a DVD player that is so old that it has problems with DVD+R disks, the compatability issue has been worked out of most modern players.

DVD+Rs are better to store data as they can hold around 50MB more, also a DVD+RW is 10 times faster to format than a DVD-RW..

Knowing about the format isn’t going to help if your DVD player cannot play it. If you are going to burn DVDs for your player I would find out which format your player can read and buy accordingly. If you are going to be burning DVDs for a few people you might want to find out which format their DVD players can read, you might end up buying a stack of both formats.