I did the same thing to Ys SEVEN's OST a few months ago, and I decided to go with Ys6 now. Check it out, if you please!
I really like the feeling of Ys6 music... It's not actually quality, it's just the touch that feels nice to me. "The Depth Napishtim" is one of my favourite final boss themes ever. Feels so damn comfortable All I wish is that they had a second default boss theme, like they had on the following games.