If you really want to get your hands dirty with powerful synthesis, the Kurzweil leaves the Korg standing- not that the Triton isn't powerful but the synthe architechture in the Kurzweil is just soooooo Deep! Yes adding the MOSS boards adds one of the most powerful synthe engines around to the Triton but this is an optional extra.
Soundwise, these 2 instruments are like chalk and cheese!- but they both sound AWESOME in their own special ways and it's up to you to decide which you prefer.
The Triton is much more powerful in the effects department (even adding Kurzweils KDFX option) but when it comes to sampling functions, the Kurzweil is more powerful- however, it will be interesting to see what Korg add to the sampler in version 2.0.
The Triton is much easier to get around than the Kurzweil with it's huge touch screen, but both have good operating systems.
Both sport decent onboard sequencers with their own unique ways of doing things and they both sport decent arpeggiators. I love the huge ribbon controllers on the Kurzweil and the 8 sliders are nice too, but the Triton also does quite well in the real time control department.
If you can't decide then you could always buy both!!!!!!!!!!!!!! Cheers.