Korg has now integrated EMC styleworks quite well into its system, and so the conversions of other styles are way above what can be achieved with the standard version of styleworks, so all is not lost for additional styles.
As I have mentioned before, sounds and styles are very personal so there is not one board for everybody just yet.
Personally as I regularly listen to live music, (Real musicians and instruments) I would take the Korg over the Yamaha.
Enjoy whatever you finally decide on, and don’t feel you have made a mistake just because others don’t like it.
In case you’re interested, here is my personal preference:

Styles:

Roland
Wersi
Korg
Ketron
Yamaha

Sounds:

Wersi
Korg
Ketron/Roland
Yamaha

Hope this helps

Bill



[This message has been edited by abacus (edited 06-29-2008).]