Yamaha Genos vs Korg Nautilus: Sound vs Sound Comparison! Which one SOUNDS better? 

I agree with the comments below. The way I got around this was to use two keyboards and midi them together. A Nautilus 88 and a Korg PA5X. the PA5X is on a par with the Genos 2 ( I think it's more personal taste than which is the superior arranger). Biggest plus for me is playing the PA5X piano's using the Nautilus 88 weighted keyboard, they just sound so good.

Except for the Nautilus clav, which was nice, the Genos consistently sounded better--brighter, cleaner and more realistic, with articulations on the acoustic instruments. This was especially obvious on the Brass sounds. This is not a surprise--the Genos is based on Montage sounds which are a decade newer than the old Kronos samples in the Nautilus. In fact, this is an odd comparison. The Genos is an arranger that competes with the Korg PA line of arrangers and it costs almost twice what a Nautilus does. A better comparison would be with a MODX or Montage M, but the results would probably be pretty similar. The Montage M is a bit more expensive than a Nautilus, but a MODX is actually cheaper than the Nautilus.