I have both the Rohrbaugh R9 and the NAA G380. As has been noted, the trigger on the R9 is much better than the G380 out of the box, the R9 is almost 6 ounces lighter, and there is also the matter of caliber -- 9x19mm Parabellum vs. .380 ACP (9x17mm or 9mm Kurz).
I consider the R9 to represent the ultimate in pocket pistol design.
As has also been noted, the G380 is a straight blowback design with the barrel being an integral part of the frame. This results in comparatively "stout" felt recoil for the pistol, even though it's built like a little tank. Due to the simplicity and ease with which the G380 can be field stripped and reassembled, I carry mine whenever I'm going to be in conditions where I may lose footing and wind up with my backside in muck and mud. I can field strip the G380 while sitting on a flat rock, clean it out by sloshing it around in fresh water, spray it liberally with Ballistol, slap it back together, and expect it to be operational -- all within a minute or two of time.
So -- my advice -- get the R9 first, but put the G380 on your list for consideration down the line.
(http://i2.photobucket.com/albums/y30/RichardS/R9G380Side-by-Side.jpg)