The only reason I could see myself needing 4 channels is to have more control over the sample decks. I have used both serato and traktor and currently have traktor pro 2 on my laptop, so I think traktor would be the route to go to save $ when I would have to update Serato Intro that comes with most controls. The only problem I have run into is an issue syncing songs. I’m not sure if I am just being dumb and not realizing a way to fix this, but with Serato I could easily sync up 70 bpm and 140 bpm when I was mixing dubstep. With traktor, it always makes the bpms match exactly so my 70 bpm songs will have their speed doubled to reach 140 or the other way around. Is there a way for me to fix this? I have also heard that you can serato controllers such as the pioneer ddj-sb or the Denon mc4000 to traktor while you cannot map a traktor controller to serato. If this is true wouldn’t it be a better idea to buy the serato controller, try it out with Serato and map it to traktor if I am not happy?