Hey chums! My favorite tourney has got to be either the Spleef Tourney, since I love Bow Bombers, Super Spleef and Hot Trot, but the Sly Killer Tourney is also quite fun, with Bow Bombers and Frozen Frenzy, plus two random games, giving a good range of fun. But jeez, theres a lot of teamers in FF. Looking forward to your favorites!
I personally love Twilight Forest for it's sense of progression, as it is a complete experience that scales difficulty with your progress and is an overall great new challenge to simply add to your vanilla game.