Reply to Which Mixer should i get?

I have been doing mashes and just having fun mixing music for a hobby nothing crazy, but i have been using a mix track pro for the past 7 months and I am looking to get something a little better that I can do more with, I was looking at the Traktor S4 and S2 but i dont know which one to get because the only thing i mix is basically edm, i read that the s4 maybe not useful for people just needing two channels, is this right? Does anyone else have any other opinions.
Thanks