Have played the SNES/PS1/and DS Versions.

I've been playing the one for PS1, and I'm very very curious what the one on DS is like, Like I know the graphics are better, But I'm curious as to what Gameplay is like, the battle system, What are the changes? What more or less can you do in it?

I'm having fun just exploring the crap out of this game, seeing chocobos and fighting tons of enemies, grinding and grinding. This is a fantastic game!