Tales of Innocence was a pretty big disappointment for me. The sample editing (often called "synth") is bad even for DS standards, and most compositions are just cloning the "typical" Tales melodies/instrumentation without bothering with something like complex or often even any kind of accompaniment. I expected different from a composer new to the series. Any of the previous Tales composers would have done better imo.
Tales of the Tempest, while being developed by Dimps, had the Tales Studio's sound team (which besides Sakuraba included sound effects and voice editing) working for it as well as two no-names (likely trainees) directing who may appear again in the upcoming Tales of Symphonia: Knights of Ratatosk (if having the same Namco producer and being listed on Tales Studio's website is any indication).
The music in the Tales of Vesparia trailer is new. All the music (except the jpop piece obviously) in all the Tales of Symphonia: Knights of Ratatosk trailers so far are reused from Tales of Symphonia.
Personally (Sakuraba) composition and sound design wise I consider Tales of the Abyss the best, followed by Tales of Destiny PS2 and Tales of Phantasia SFC. People not liking Sakuraba's adaption in composing and mixing style after switching from sequenced to streamed music likely prefer Tales of Phantasia, Tales of Destiny PSX and Tales of Destiny 2 (Jp) over everything else Tales wise. Tamura is inconsistent in quality, best in ToP, lately focussing on odd kind of electronica. Tales of Legendia has its own kind of music carried by live performances (not done in any Tales game outside ToL), people liking that should look at the second part of the ToL soundtrack which was packed with the second ToL drama CD, the Mr. Driller console soundtrack, the diverse Idolm@ster pieces, Tales of Fandom 2 opening/ending piece as well as Kyo Kara Mao for PS2 (and by now possibly more I'm not aware of). Like Kazuhiro Nakamura (ToI) I don't consider Takuya Yasuda (ToI sound design/effects, Tales of the World: Narikiri Dungeon 2 & 3 & Radiant Mythology composer) worth mentioning at all.