Twilight is basically harder, fatter, more aggressive full on. You can have many different sounds in the twilight subgenre. For example Sidhartha or Tryon are more fat, meanwhile Seroxat or Azax Syndrom are like harder israeli full on.
I didn't mention any South African artists because they have their own unique sound even though they're technically twilight (in fact the term twilight has been coined by South African artists).