As much as either guy has the capability to outplay/fool the other, with them going back and forth (and we might see some nutty stuff from Ousen soon)...for now at least, Riboku still is overall the slightly superior mind.
And man...just who else in history is gonna have an edge on Ousen in a clash of warfare intellect? I'm not sure lol.
Shin will always and forever be the type of general Duke Hyou was but a little more agile/powerful.