Tales of Phantasia for me and always will be. Sure, the character setup is pretty damn standard, but then again maybe that's why I like it. It's also the only other Tales game I've played to completion besides Symphonia and Symphonia felt like a bit of a slog towards the end. That's probably because I was power gaming the hell out of it, though. I've played Destiny (been a long time, I need to pick that up again), Legendia (never finished, but might try it again. I liked Chloe), Eternia (got sort of bleh in the middle, so I quit), Abyss (the less said about that, the better. It's sad when I consider Jade and MIEU the most tolerable characters in that game.), and currently Graces f (this one is a lot of fun, really enjoying the characters and banter in this one).
From what I have seen of Vesperia, I dearly want to play that, too, but I'm not willing to pick up a XBox for it so I'll likely import the PS3 verson from Japan. Kind of a shame, because I liked what I heard of the english voice acting.