So let me see if I got this right?

9000Pro: Ease of use is top notch, sounds are good, some are great. SMF playback is ok, it uses it XG voices instead of its better sounds. Vocalizer board is also good.
Styles are more on the Rolandish, laid back, useable but not very busy.

SD1: not as streamlined in the OP system, not as bad as Korg, close to Roland, not as easy as Yamaha. SMF very good, uses top voices, and has a better SMF find system. Vocalizer board is decent. Styles are probably on the top list, very busy, but cna't certain varations, take it down a bit.