I'd say it depends on what you wanna do.
If you're into turntablism (fast and heavy scratching and so on), the TTM-56 is probably the best piece of hardware you can get (together with the Xone:02). You can mix with this mixer too, but that's not the main purpose of the TTM-56. Smooth faders, extremely fast cut in points are the big advantages of this mixer, and this is necessary for turntablism. The FlexFx system is a breeze to use also, if you plan to add an effector later on.
Great sound and build quality.

If you're more into plain mixing, but still want some abilities to scratch decently, I'd opt for the Xone:32. It's more designed for mixing than for scratching. Awesome quality, the VCF's are sweet (I own a Xone:62 and the VCF are great). The only downpoint I can think of is the placement of the gain pots (on the backpanel), but you'll have to accomodate to that.

So I'd say if your game is turntablism : TTM-56 or Xone:02
If you're a mixologist : Xone:32

You can't go wrong with either of them...