I doubt between these kbs.. I have seen both, and played too a litle, but...
Sounds are ok in both, styles liked some more in the Korg, piano some better in Roland.
At first seen, Pa is much more kb because it has a lot more buttons: more buttons for sounds groups, for styles groups, for intros and endings (3, Roland only 1), more for some functions.
So, apparently, play PA500 may be more direct, and Roland less direct, and more work with menus into screen.
Fills are separated in Korg, but it may be better or not, I don't know.

At the end of day, I question myself which will be better for me, considering I like slow music, instrumental, new age, ballads, and not rock, not funk, not jazz, not old tratidional dances. I am home player, and I like to do improvisations or compose music more than play popular songs.

Any opinions will be apreciated.

[This message has been edited by Artaher (edited 10-31-2008).]