Reply to Numark 4TRAK vs. NS6

I'm looking to get a new controller and am tossed between these two. But if I'm not mistaken aren't they both basically the same thing besides the NS6 runs Serato Itch and the 4TRAK runs Traktor? Is one better then the other? And also does the 4TRAK come with Traktor or do you have to purchase it separately?