I grew up playing Gold version from the time I was 6 to the time I was 10, when R/S/E came out. Over those four years, I, without abusing the cloning glitch (save to trade a cloned Ho-Oh to my bro for a cloned Lugia when we failed to catch them, as well as the version-exclusives), completed the pokedex, found one of every Unown, took my team to contest (against people twice my age, once) and won, and generally pwned at the game. Let's just say that Gold version is my favorite for the nostalgia. For the game itself, it goes to Crystal. A mixture of G/S, which makes it awesome automatically, plus Lugia and Ho-oh are higher-leveled than normal.