I actually have both of those sequencers...the SQ-1 is nice for running typical Berlin school-type sequencing loops, plus it plays nice with my MS-20. The BSP is a different beast altogether, though...much more internal complexity and potential, especially with its software configuration capabilities. I did a live piece a few years ago that had two BSPs merged into my Kawai K5m...none of the four patterns were equal length or at the same tempo, which gave me this nonrepeating ambient wash that worked beautifully once the synth was properly processed. If you were going to be forced to make a choice, the BSP is the one to have...but having both is perhaps even better!