Reply to S4 or mapped ddj-sx ?

Hey i have not been dj'ing for a few years now, got in some debt and had to sell all my gear Used to play techno on 3 1210's djm 600 and also had a korg chaos pad... anyway i want to get back into it but am gonna go digital.

I will probably use traktor over serato but am having trouble deciding between the s4 or a pioneer ddj-sx mapped to traktor. i want to be able to do a little scratching (nothing to fancy) sample and possibly hook up some 1210s maybe a drum machine in the future.

Basically wondering what peoples thoughts are on it and, would like to know how the pioneer maps with traktor as i have zero experience with mapping or digital. Also curious as to how serato holds up against traktor.

Would appreciate your input thanks