Castlevania wasn't about atmosphere through music.
Maybe not as a whole, but SCIV definitely tried going down that road, to much success. And that's the kind of DNA I see in the LoS series' music. The only difference being that IV still had stage by stage music, despite being very moody and ambient in a lot of the soundtrack, while LoS goes full movie and has almost no level specific music, except for Vampire Killer in the Music Box.
That said, I can agree that LoS2 has IMO, a stronger soundtrack than LoS1, although I still like both. LoS2 definitely sounded more like a dark gothic game. And I think the chanting in a lot of the music really gave it that almost Gregorian quality. The fact that there was also synth involved also gave it a bit more variety and depth to it aside from just being bombastic music. There also felt like there was MUCH more violin than LoS1 which was MUCH more trumpets and other such wind instruments. In general I like LoS2's composition and instrumental choices better. I mean, themes like this
https://www.youtube.com/watch?v=-ATsvuJ1NzkAre just amazing, and IMO, just as worthy of the Castlevania name as previous OST's. Dracula's theme itself with it's piano, goes without saying. or the Gardens theme. LoS2 has much more memorable music than LoS1 overall, even I can admit that.
Feels to me like with LoS, by trying to "establish the pre Dracula world" they really weren't able to establish a very solid identity in tone OR music, since by MoF it's all different, and LoS2 follows MoF's suit.