>>48999489Colors are more saturated, caves look less dark, the music is much more lively, and lot of the character redesigns look younger and friendlier (Gold/Ethan is a good example)
This isn't a diss of HGSS though, they're still probably the best games in the franchise. I just felt like GSC had a different atmosphere, although I don't know how much was intentional vs how much came from the limited sound and graphics on the Gameboy.