Reply to Mixtrack pro vs Mixtrack+DJI/O?

Was believeing of expanding my set to include an X-Session Pro, but now I'm believeing that for not that much more I could get a Mixtrack (I can get X-Session for about 50 or Mixtrack for 75+)

At that price, I figured why not take the platters just in case, or for some fx sweeps, etc.

At this point, I still need an interface (unless I use one of those $5 usb headphone jacks, which really would work...).

If you were looking at something entry level like a Mixtrack, would you get the one with the built in interface, or get a separate unit?