It's between the music from RSE and the music from Black and White. Hoenn is my favorite mainly cause the music is so spectacular. Every route you go, you hear hundreds of blaring trumpets , pianos, and rolling drums.
And for Black and White, alot of it blew me away. It's just beautifully composed and just an awesome mix and I love how in some city the music has layers and extra instruments can be added on when talking to certain NPCs. My favorite in BW is Village Bridge because it always takes me away cause it's beautiful, plus I love how I can listen to something slightly different each time I go.