In my opinion, the new MKs are better, both in graphic quality and difficulty. The old ones, with their digitezed palette-swapped actors and plain backgrounds, just pale in comparison to the sickingly sweet graphic details of the new ones. And they were way too difficult to even bother with. The new MKs play fair in difficulty and it's fatalities are easier to do.

In 1998, I would have said MK4 or Trilogy would have been my favorite. But since MK Armageddon is basically the next MK Trilogy and has the same 3D feel of MK4, that's my new favorite.