Jo, you're welcome and thanks for your informative evaluation report
This is assuming both boards were recorded 'equally' with flat EQ, but that parameter always needs adjustment.
I have a PSR-3000 that sounds bland with factory EQ settings(flat), but much more alive after tweaking both the EQ and the drums mixing console/filter/harmonic content...along with adjusting other sounds and styles to taste.
Again, IMO, not much difference in sound with these boards (or price) out of the box. To me it's a matter of the OS and Company support. I never owned a Korg, so I can't comment on the OS or support, but I know Yamaha, and to me, they are #1 in these categories, along with third party support, tools, styles, sounds, etc.
That said, the PA600 looks and sounds interesting, I especially like the touch screen, and drums.
I'm in the market for a new MOTL arranger, and it's nice to have choices at competitive and comparable prices (collusion maybe?)
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Larry "Hawk"
♫ 🎹🎹 ♫ SX-900