haven't used either myself, but from what i read it all comes down to personal opinion at the end of the day. from looking at the two, the s4 looks like it takes more advantage of the features software brings (sample decks etc.), whereas the t1 tries to mimic a more traditional cdj setup with larger pitch faders/jogs and that kind of thing, but less features. So all personal preference imo, see if you can demo both in a store before you purchase