I've used the older +R/RW TDK drive, and it worked great. Haven't used the dual drives yet, but will be getting one soon. It would be nice if Plextor came out with one, though (I've got the PX-504A now).
I try to avoid +RW media (I'm an impaitent little bastard, and 2.4x just kinda sucks) usless I have to use it (for example, a test burn created with an "unproven" authoring program).
As for the +/- debate, well....I do mostly data discs and the + seemed to be a bit better than -, but now they're pretty much equal. It'll mostly depend on what you DVD players like/don't like. Haven't yet found one that doesn't play the +R discs, and only one (standalone) that wouldn't play +RW. The PS2's don't like +RW. Any RW will be less compatiable, though.
The best choice? Depends on how much you want to spend. If you go to Best Buy or other large electronics store, the two are about the same price. Online, you can get -R discs cheaper (try
www.meritline.com). You pay for speed, though. 4x and 2x DVD-R's are more costly than 1x.
My local stores now have 4x +R discs for the same price as 2.4x discs (~$2/disc), so that's all I'll be using in the near future, even if I get a dual burner (which is on the shopping list).
Can't remember if Best Buy or any similar stores have the 4x -R discs. Anyone else know?