Reply to Vestax vci 400 or Pioneer ddj sx ?!?!

Hello every one, i would appreciate it alot if you could help me choose between the vestax vci-400 or pioneer ddj sx, i am planing on buying one of these in a couple of days but i don't know what to buy.. previous to my next controller i used vestax vci 300 and now i want to upgrade but it just dont know what to get.. i am serato and traktor friendly so i dont mind the software please comment ! thanks !