Ys games' music hasn't been as strong, Xenoblade X is a far cry from Xenoblade's excellent soundtrack.
That's a bit harsh IMO, recent Ys have great soundtracks.
Xenoblade X's is very eclectic, I see how it could put off some people, especially after Xenoblade's very "traditional" sound, but it's quality work too.
Unfortunately, what I heard from Bravely Second doesn't inspire me the same confidence, especially following up Revo's brilliant work. =( And that seems to be a general consensus, I haven't seen ANYONE claiming Bravely Second's soundtrack is better.