I've played all three Gamecube RPGs and Tales of Symphonia is definitely my favorite. Baten Kaitos is also nice but does have some flaws. Baten Kaitos Origins fixes most of them and is a much better game, although the camera is still forever far away and it still relies on "talk to the right NPC to move the story forward" design too much. But Origins at least lets you discard cards, so the luck factor isn't so glaring.

I don't like Skies of Arcadia, so I won't say much about it. /FeelsRotoandMilfWrath

I dont like Crystal Chronicles, either. /FurtherRotoWrath

Alright, I lied and I haven't played Thousand-Year Door yet. But I will soon. It won't be better than Tales of Symphonia, though.