What's the Difference Between DVD-R and DVD+R?

Diffen.com has a good chart and video explanation of the difference between the two.  DVD+R gives the greatest compatibility with off-the-shelf DVD players, if you happen to want to burn a movie on your PC to watch on your TV later.  A snippet from their website (full credit to Diffen):

Origin and industry support

The DVD-R standard was developed by Pioneer. It is used primarily by Apple and Pioneer. In addition, this format is supported by the DVD Forum, but is in no way an industry standard. The DVD+R format is supported by Philips, Dell, Sony, HP, and Microsoft.

EDITDifferences in Features

DVD-R/RW discs can only be written to in one layer on the disc's surface. On the other hand, DVD+R/RW discs can be written to in multiple layers, giving them slightly better and more disc storage than the DVD-R format.

EDITAdvantages of DVD+R

According to the claims of the DVD Alliance, using a DVD+R (or DVD+RW) recorder will provide the following advantages over a DVD-R recorder:

1. Instantly eject without having to wait for finalized formatting.
2. Ability to record one DVD disc partially on PC and partially on television.
3. Background formatting: while the disc is being formatted, you can simultaneously record on already-formatted portions of the same disc.
4. Enhanced ability to edit filenames, movie and song titles, and playlists.
5. 100% compatibility with all other DVD players, while still enjoying these extra recording features.

	DVD+R Currently 3.02/5 1 2 3 4 5 Rating: 3.0/5 (94 votes)	DVD-R Currently 3.06/5 1 2 3 4 5 Rating: 3.1/5 (104 votes)
Layers:	Multiple	Single
Size:	4 706 074 624 bytes (4488 MB)	4 706 074 624 bytes (4488 MB)
Pronunciation:	DVD Plus R	DVD Dash R
Backed by:	DVD+RW alliance (Sony, Yamaha, Philips, Dell, Microsoft etc.)	DVD Forum (Apple, Pioneer , Mitsubishi, Hitachi, Time Warner etc.)
Drag & Drop:	Yes, supported. This technology is code named Mt. Rainier and is a hardware feature.	No, not supported.