I have to agree with this. ^ I never really found FRLG that entertaining being a mainstream Pokémon game, but in terms of it being improved, yes. The graphics, the option to choose being a boy or girl, and just the quality of the game really.In terms of RBYG, I think FR/LG is better(but not "much better").
As for comparing GSC to HGSS, I have to go with HGSS. Everything about this remake was so entertaining. They brought in many features and I know it has caught a lot of people's attention in interests. This remake was definitely not a disappointment in anyway. To me, at least.
So I guess I would have to go with the remakes on this one. Remakes are meant to improve anyway. :P