My favorites are definitely haze, dreamenddischarger and Ougon Cross arrangement of liberatedliberater.
Haze is just so smooth and chill, some people say it’s boring but I like how it’s so simple and relaxing.
Dreamenddischarger is like an epic mix of worldenddominator and goldenslaughterer. zts does a really good job at creating classical trance progressive pieces. It has a lot of variety in it, but it doesn’t became too disjointed. There are a lot of dynamic subtlety and layers to zts songs, just like in the game itself. Not only it constantly evolves, but also creates pleasant harmonies along the way. It’s surprising how in song with such diversity, everything can be clearly heard. Sometimes I wonder if I would have actually loved Umineko, if it wasn’t for the music.
I don’t think there are any bad tracks in Umineko. But I composers made a really good job at creating this magical, haunting and epic atmosphere.