I had both. They are so different in the way they operate and sound that comparison is really hard.
PSR--open the box, plug it in and play.
BK9--open the box, spend two weeks setting things up and then play! Exception is piano and organ. BK9 sounds great there immediately.

I agree the Bk9 is still a work in progreess for me after countless hours of programming. This is after I spent a ton of time with the BK7M before I got the BK9. I would also love a quicker navigation route for live play eventually will experiment with using the IPad to change registrations.

BTW I was speaking to a salesperson at Sweetwater Sound about a recorder I bought and the conversation went around to Roland. They discontinued the PK6 bass pedals even though the VR09 live preformance keybaord has a proprieatary jack for it. DUMB ! The price if the PK6 was close to a grand so that explains the reason for its low sales.
Also the BK7M is discontinued and the BK5 and 9 are soon to follow.
Roland does this a lot and its annoying to me.
I was hot to buy one or two of the SA300 sound sytems a few years back. Never saw one and no stores knew anything about them. Yes they would order it but never a definate date on delivery so I moved on to JBL 515XTs Then shorty after the SA300 along with the really hard to find SA1000 amp was discontinued too.