>>48129579GSC is better aesthetically and has a way better soundtrack. It also understands that less is more when it comes to certain moments in the campaign. I'm mostly thinking about stuff like HGSS including a literal unnecessary song-and-dance when you encounter Ho-Oh and Lugia.
At the end of the day, though, HGSS has so much great content crammed in there. The post-game is particularly noteworthy, and I give it major props for allowing the player to actually use Dark types other than Umbreon on their in-game team. But the real answer is to play a hack like Polished Crystal that adds in the extra content while keeping the Gen 2 aesthetics.
>>48130310The most recent version allows you to turn off Natures. I think you can even turn off Abilities.