I voted for Red/Blue/Yellow. Because it had the suckiest after game section. I love it in games when you can still continue a storyline after the credits have rolled. While Ruby and Saphire didnt have much after E4 gameplay, Red/Blue/Yellow had Mewtwo, which wasnt that great, and thats about it.
G/S/C is the best, a whole new league and champion after the credits have rolled. Brilliant! lol