With subordinates, it would be Kochou. Keisha has some pretty uninspiring subordinates while Kochou has the friggin Dumpling Lord.
As for the favourite Shin fight topic going on around here, I am actually quite fond of Shin vs Mangoku. Mangoku stuck with me as an example of an utterly inhumane character that was written well enough to be legitimately sympathetic (to a certain point of course. Lol.).