So I guess it would be safe to say, The 9000Pro is well laid out and probably easier to navigate around more of a universal type keyboard setup like the other big guys, korg roland and so on. Japanese boxed styles, as Roland and Korg.
Solton, probably a little personal design and programming, not using the standard " string" sound or the "sax" but doing it the way they feel it should be done, like a rebel