I think DB (and DoF actually) are more "melodic" (in the style) but structurally complicated, Disgorge are relatively more straightforward in terms of songwriting but more spazzed-out to the point of being nearly random in their riffing. Disgorge doesn't really convey much of a feeling for me.
That is exactly why they convey more of a feeling for me. There is no melody in a nuclear explosion. I have long thought that Disgorge were one of the few bands to truely capture the seeming randomness found in stuff like Legion from Deicide.