Doing your research already?
One thing I really liked about the QY700 was that it separates the phrases (individual note patterns) from the track. So you can have phrases 1-8 on tracks 1-8, then while it’s playing you can type 5 and enter into the number pad and track 4 or whatever can be playing midi phrase 5. You can then mute in out out patterns, and use parts A-H when you want to change a lot of phrases at the same time - if you see what I mean. So I would start building bits up, with mutes, swapping individual phrases for variation in real time, then dropping to part B. Etc.
You can also change the groove timing in pattern mode while it’s playing to create instant interesting rhythms!