Darkened Shrines is 10x better. The riffing is still technical but the focus is not on technicality. There's a frenzy of technical churning riffs punctuated by insane blasts and fills that gradually climaxes and resolves into really great, memorable, eastern melodies and slow, epic chord progressions. Unas, Slayer of the Gods shits all over anything on the two you mentioned, as does Sarcophagus. The vocal performance is more dynamic, as all three contribute vocals more or less equally. There's also restrained use of keyboards and ambience that really adds a lot to certain tracks.