Micron:
+ Multi-Timbral
+ MUCH deeper synth engine
+ Vocoder
- Crappy feeling keyboard
- Oddly placed pitchbend wheel and sliders instead of mod wheel
- B*tch to program without 3rd party editing software (there's only 1 programming knob)
- No battery power
- No USB
XStation:
+ VERY graphical easy to use interface
+ XY Pad
+ Nice keys
+ Aftertouch
+ Battery/AC/USB Power (it and the X-Station are the only USB powered synths)
+ Nice 1in/2out audio interface (you can record both the synth & 1 mono source at once)
+ Nice Mic Preamps
+ Nice knob layout for Live's Macros
+ Nice midi control modes with a supplied editor
- Mono-timbral
So if you wanna go for creating deep/wild/experimental sounds and want multitimbral and don't mind shelling out for an editor, go for the Micron.
If you want slightly more hands on with better computer integration, a better control surface and just want a really nice synth to play, go for the X-Station.
Hope this helps!