Perfect Dark, GO was a classic and still is, but Perfect Dark used GO as a platform to make the most well balanced and lasting FPS on the nintendo 64. My vote will always go with PD, even though I played GO heaps, I know for a fact I played PD much much more, and even to this day still get urges to pick it up and belt out some moves in combat simulator. And even though its outdated, I still have just as much fun as I did that first day I put that red expansion pack in my 64 and started my experience.
Edit: Perfect Dark: 1
20/07/2007
Melbourne, Victoria