Lee, I haven't heard either one yet, but I already know that I don't like the key feel on any Yamaha arrangers, so I'd give the edge to Korg just for sheer playability. I realize that this is an objective opinion, but over the years, I have come to rely on feel more than sound. If you've ever played Rhodes or Clavs, you'll understand what I mean. There are so many nuances that you get from dynamic touch and velocity, so if you don;t like the key feel - it throws your whole game off. I'm getting very comfortable with the keys on my new Nord Electro3, and I'm actually thinking of taking 2 boards out just so I can enjoy the sounds that it does so well from my formative years as a young player in the 60s and 70s.
I remember my first Rhodes like it was yesterday .... the smell of the Tolex, the ring of those sweet bell tones .... it was a musical orgasm, and this E3come SO close to that ... it's like a dream come true.

As for orchestral sounds .... I'm a rhythm player who accompanies my singing. I need chords sounds more than lead sounds - always have. I could play all night long with a good solid piano(EP), bass, drum sound. Add organ next and everything else is gravy!