It depends on what you want - originality or classic.
ToS has a real-time combat system on a limited 3D "arena". This means you can control any character and hack and slash as much as you want (fighting is manual for human-controlled characters). ToS also has cel-shaded graphics, which give the game a very "anime-style" feel.
Baten Kaitos has a card-based (not like Yu-Gi-Oh!, but more like KH: CoM) combat system, where speed/reflexes is a big key. Cards represent items (armor, weapons, healing, etc.), and combat is turn-based. Baten Kaitos also has fancy 3D graphics, rivaling Final Fantasy. Backgrounds are often colorful, and the amount of color and spontaneity will represent the land itself. For example, an industrial town will have large, gold buildings and active factories.