Reply to Upgrade to traktor s2?

Hi, I have been using a numark mixtrack pro for a while now and I am considering a traktor s2.
What features does the s2 have that the mixtrack doesn't?
sorry if this is a bit of a stupid question but I am not really wanting to spend my money without
it being worthwhile
I do also have a midi fighter.

Any replies would be great

Cheers