I like Belmont's Theme too but it's just on a completely different direction from the rest of the soundtrack. Nice gradual build-up of layers and theme. But those two elements are almost absent from the rest of the tracks. It really isn't indicative of the rest of the soundtrack at all. Of course, in LoS's case, that's actually a plus for it. Would've been more interesting to see more tracks in its style, maybe even if it was used as a motif!
Also, Demon's Souls and LoS are wholly different beasts. Demon's Souls employs a lot more minimalism. It has lesser instruments, it actually incorporates the use of silence, etc. It also has fun and even evokes the feeling of old movies from the 70's while still retaining that deep desolate earthy tone with its use of brass and percussion. That familiarity with 70's soundtracks almost gives it a campy tone while Lords strives all out to be epic. Lords tries to pack in everything, tons of little orchestration techniques and all, and the tracks themselves are on this feverish pace of progression, constantly changing. The way that brass alone is handled between the two sets them completely apart. They're really opposites~