Pioneer A09 or LG GSA 4163B?

If to put aside LG support of DVD-RAM, which of these drives performs better as DVD writer/reader and DVD/CD ripper? I could not find a comparison of performance for those models. What would you recommend? I also need higher compatibility of recorded media with stand-alone DVD players and support of Ritek media at higher speeds. And the last but not the least: I want to use it as External USB/firewire drive. Will they both perform equally as External drive?