That's hard to answer- in my experience you can't so much group them by type so much as brand. I had a '47A (not the newer Ai) and it plays most of them, but not all. That's pretty much the story with all of my players. My Denon is fussy with all burned DVDs, but it's very solid with JVC brand DVD+R/Ws. Go figure. My other Pioneers (DV-260, DV-563A & DV-656A) are very solid with R/Ws of the few brands I've tried, but again I haven't tried many (as they're expensive and not something I need many of). The DV-47A is solid with JVC brand R/W's, or at least mine is. Mine was an early production run, btw.
Sorry if that's not very specific. Maybe someone else can chime in with their experiences.