Reply to 3 x cdj 2000 vs 3x cdj2000 nxs

A quick question:

Is it worth selling my 2x cdj 2000's and replacing them with 3x cdj 2000 nxs or is it better to buy 1x more cdj2000. Are the cdj 2000 nxs rly worth the upgrade?

Anyone that can shine a bit of light on the differences would be welcome


(Used for 3-4 deck techno layering)