Symphonia for sure. It's still my favorite one in the series. The battle is half 2d/3d where you're on a 2d plane with the enemy you're targeting and the camera moves with that so it still controls like a 2d fighter. It's also one of the best games I've been played. Earlier ones are a bit primitve and later ones try going more full 3d with battles which is fine, but I love the Symphonia style. It also has a pretty awesome story