Although there aren't many sound demos for the BK-9 yet, I think many sounds will be brilliant, for sure the 22 supernatural ones, among them 3 GrandPianos and some E-Pianos (can be seen on one of the pictures showing the double display). You won't get these 22 sounds on your Stage. But otherwise, it depends on what you need. With the SRX 6, 7 and 9 you will get 400 sounds per board, and if they fit your needs exactly, it could be better than the BK-9 selection. Check the SRX demos on soundcloud and PdF-manuals of the SRX boards at Roland.com support. You should also consider that you cannot edit sounds on the BK-9 the way you can do it with the Stage! You don't have the architecture with patches consisting of 4 tones and performances consisting of 16 patches, it's simpler and probably adapted to live requirements of entertainers.
