The big advantage of the XDJ-RX is you don’t need it connected to a laptop so comparing all the different dj software is pretty irrelevant – you would prep your tracks in recordbox, then export them to a usb drive.
DJ Vintage is right though – if the only reason you want to change is for possible future club play then there’s no real need.
If you can mix on your S4 it shouldn’t take long to pick up anything else.