I have traktor control S4. I’m no teenager but this is my first DJ package I have bought to get started. They are great and I believe traktor to be the front runner for DJing.
I like the s4 controller as it shows you on the hardware all the things needed to get familiar with terms and functions needed for DJing. I have not tried the S2 but I assume it is only for 2 decks so even easier to get started.