Reply to DJM-900NXS vs. Xone 4D

Hello guys!

As an amateur in DJing, but running little party gigs in french, vocal and discohouse music for over 12 years I see a lot of mixers...

For about 4 years i changed my setup to laptop and midi-mixing with files...

My actual setup includes a xone 4D and a a maschine (in controller-mode) both controlling Traktor.

My thoughts are now going around the DJM900 Nexus now (i've got the old DJM600 years ago). Is it possible with the mixer to build a semi setup?
The Xone is great - but i'm believeing of better sound quality and more Possebilities while mixing.