My guess is, whatever device he posted to this forum on could run a FAR better sequencer than anything in the Prelude (or the BK-9!). To be quite honest, I'm astonished that anyone nowadays uses any built in keyboard sequencer.

But if you ARE running a sequencer on a gig for SMF's, chalk one more up to the BK-9 over the Prelude or BK-5, which can put up to four Markers in an SMF and allow you to freely restructure your song on the fly. I find that incredibly handy, and only wish the BK-9 could do the same with audio (it can't, even using the Key Audio triggered by a sequence track... there is a tiny delay before an audio clip gets triggered, enough to throw off the timing a hair).

But I do my sequencing on a computer, have since the Atari days in the 90's, and wouldn't use a built-in if you paid me!