Here's an opinionated piece which says DVD+ are better for archiving.

For the full argument, its pretty extensive, see:

How To Choose CD/DVD Archival Media

I have to admit, I've burned video DVDs on both DVD- and DVD+ and both have played on multiple different DVD players.

i use -R for everything unless im burning a dual layer dvd, then i use +R.

the +R standard of DL discs alows you to specify a layer break - which is very important if you are copying a dual layer video disc. if its just data, you can use either

I give the whole issue precisely zero thought - when I walk into Officeworks or wherever, I pick up the closest one to hand and it always works just fine. Isn't that the point of being a Mac user?

I've actually had a few issues with burning since I switched to Mac... my old TDK DVD+Rs no longer worked good (or they would work once or twice and then I'd keep getting errors like this) so I decided to switch to Verbatim DVD-R and they worked a few times and then I got the same problem....

I came across this webpage which actually helped a lot and in the end, after testing with a friend's TDK DVD-Rs (which finally worked!), I went out and bought a pack and have been using those ever since.

I've got a whole heap of new coasters as a result, but now it works good so I'm happy