Actually, according to me, the drums are much better in korg than yamaha. I am working in a fusion band where we have drummer, guitarist, etc. so, I no need to play styles on the stage dirrectly. I just need very well programmed sounds like piano, strings, synths, brushes, saxs, and some sounds which are really uncommon. but being a sound editor, I also need the better drums sound as we often record drum tracks using keyboard.
moreover, my first requirement is well and thick sound varieties.