TWD, the only Ketron I owned was an X1 and it was beautiful. What struck me about your previous post was what you disliked about the Yamaha is what I found the problem with the Ketron, I found the styles really difficult to suite my type of music, or rather, to suite the range of music I play. I love Latin and being Italian of course Latin styles are important so no problems there, however, I found the rest of the styles a little out of range with the rest of the stuff I play, the most difficult and unsuitable were Ballads and Dance. The quality of those styles were not in question, but I found they sounded very similar. That is why I then traded the X1 for a PA-80, then to a PA1x, they had what I needed and what I am finding with the T3.
Don't forget, I used to also own a PSR8000 and if my posts still exist here from when I first posted it many moons ago, you will see that I also did voice my reservations about the quality of the drums as well, especially Latin. After hearing the T3, I believe that Yamaha have really improved the drums to the point where they were convincing enough for me to buy into Yamaha again.
If we are talking home market, then I think the Yamaha is better suited, it's seems to be more varied and sounds fantastic too. The Audya seems to be geared towards the other end of the spectrum, but that doesn't mean the T3 can't perform on a live stage either.
Ketron seems to have produced an instrument to suite the live player first and foremost and I guess they have deemed the Drums, Bass and Guitar sounds as being those primary sounds above all, and I agree. This is where I agree with Ian though where he says the Yamaha is more balanced, it's more varied.
[This message has been edited by DannyUK (edited 04-17-2010).]