Reply to s4 VS. ns6

okay so I've been looking at getting a controller of some sort and I haven't been able to fully decide whether i want to go with an s4 or an ns6. this would be my first controller, but the local high school i attend has a stellar music program and they have a Numark Mixdeck that they let me take home with me. I have done a few gigs, (nothing too big as i haven't graduated yet and I'm under age) so I'm not new to preforming or anything (i used the mixdeck that the school let me borrow) but now I'm want something for myself. I know my way around the mixdeck fairly well but I like using Traktor, and I know that the factory mapping for the ns6 is really iffy but I've heard that unique squared put out a mapping that tightened it up (a quick review on that would be nice). also i am planning on eventually getting a midi fighter so i want to know if i would have any problems with using that with an ns6. thanks for the help.