I've only played 5 Tales games. Berseria is my favorite. Best combat system, charactes and story IMO. Followed by Vesperia DE and Symphonia in third.
Phantasia would take #4 and Zestiria is the one I liked the least, even with the fact that its the same "universe" as Berseria, that game was not good.
Bonus: I really hope the writing is not as generic as trailers make it look like. The visuals are great, the combat system looks fun. But the dialogue I've seen so far its really not great.