What I really like is to have two arrangers from the opposite side of the spectrum. Yamaha definitely has it outstanding features, but so do most of the others.
Very few compare to Ketron especially when it comes to acoustic sounds. But then Yamaha is champion when it comes to rock styles as there are just so many good ones on their arrangers to choose from.
So really, it's not a matter of one versus the other, but really one plus the other. I cannot speak for Roland or Korg as I've never played their flagships yet.
Henni
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Make sure you'll fly forever!