Ns6 has tighter jogs, is larger, has booth-out, is an analog mixer (best thing ever), warm and punchy sound and even though you can map it to Traktor, is pretty much exclusively designed for ITCH. It also lacks essential Traktor-focused controls, and is thus inferior when you’re using it for that purpose. However ITCH is better with the warpable grids, tuned into the NS6 like none other and you get the Serato customer service, which is the best service I have ever seen from a DJ company. Not to mention Whitelabel, which is just badass.
S4 is a little smaller, exclusively designed for Traktor, has a sampler section, a huge community centered on mapping and experience with it over at DJTT, and fits Traktor like a glove. Also the jogs on the S4 aren’t that much smaller and the scratching is pretty accurate. Porter Robinson drops it hard with the S4, however it does lack XLR, booth, hard to see in clubs because of the lighting and it’s plastic-y.
With that said, both are fun to play with and like they said above, it all depends your software choice. I like Traktor for what it does, I just hate wasting hours screwing the map up only to revert back to the factory settings. With Serato, you just plug and go.
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