For me personally, sound quality is paramount, as is operability, styles, so long as they can provide a nice simple backing that can be edited is all I need. (All singing all dancing styles (Particularly song specific) usually bore me to tears after a couple of listens (There just too repetitive for me)

Additionally (Not related to the post however) is longevity of a board, changing every 3 years or so is a no no, I just want to change the stuff that does the work, and not have to buy a new board to get it.

Bill