Favourite soundtrack from the series is definitely Legendia. It's too bad the game itself was really so-so, but the music is overall untouchable in my eyes. Soundtrack version is recommended as it had been re-arranged.
Then might come Destiny PS2. The original Destiny soundtrack was alright, but the redone PS2 soundtrack is just awesome.
Abyss is another good one for me. It's a really big soundtrack which unfortunately had a lot of trash/generic stuff, but it has more than enough memorable tracks to rank really high in my list. Special mention for the battle themes (especially the cameo battle medley) & the world map themes. The very last part of the game was perfect in that aspect, the music played has a lot to do with my memories of the ending: great final dungeon theme, great battle themes and the best ending track of the series IMO.
TBQH I never found Symphonia OST to be that strong. Don't hate it either, though.
Overall, the Tales series always seemed like kind of a throwaway effort from Sakuraba, to me. A few good tracks here and there, and let's call it a day with the rest... Also, the track use can be pretty bad in some titles. Vesperia, Xillia and maybe Graces too (not sure anymore) all had the "that track" syndrome, where the same track would play every fucking time something sad or whatever happened. Can't be bothered to check for Xillia, but for Vesperia I'm talking about Serenade of the Morning Star, for instance.
