I voted rusher, because of the AI's nature to field a large amount of archers, so I want to close melee as fast as possible. Normally I field a large amount of Yari Ashigaru, forming around half of the main body of my army. I Use them together with one or two archers to draw out a few units on the flanks, then kill the them with cavalry support as quickly as possible before their main force reacts, When they do react I move my Yari Ashigaru in a full charge often angling towards their left flank. When most of their army is engaged I move in the rest of my melee force (the samourais) towards their right flank. to finish I charge all my cavalry led by my general in their rear, and unless completely outnumbered or in unusual terrain it does the job.