The Australian stuff like Bestial Warlust, Destroyer 666, Vomitor, and others sounds like what Sodom did on Persecution Mania, which is a sound that really can't be attributed to any of the current sub-genres. The evolution of the genre is almost like how Grey Wolves have begun mating with feral dogs in areas of their range that are threatened with extinction; it creates something that thrives and is much like the original, but is markedly different as a product of circumstance.
Axis of Advance is one of those bands whose songwriting method is beyond me. It seems clattering and raw but the songs are very complete and consistent, especially on Strike.