Reply to Controller Help

I got into djing almost a year ago and i purchased a cheap controller. I bought a Numark Mixtrack Pro and i have decided to upgrade to a better controller.

I have looked at the Native instruments s4, Numark 4 track and Pioneer ddj-t1 but i can't decide witch one to get.

After asking two of my local music shops i received different answers, one said the s4 and the other the 4 track

Need some other opinions in order do decide. What are your recommendations?