Reply to s4 + x1 or akai mpk mini?

hi there

i have the kontrol s4, and im believeing about buying a controler to compliment s4,to get more control on samples cues and fx

ive heard that x1 is suited to work properly togheter with s4, but in the other way with akai i can can get a midi controller for production and for traktor with some mappings!

wath controler will perform best?

thanks for the help

cheers