Maybe rolls? Maybe he runs faster against war? Maybe there are invisible "favorites" unique to each warrior where if he finds the sweet spot activity level/strategy/type of weapon he performs better with. I don't know. It's hard to tell with random die rolls involved. Weapons have a speed too. I haven't used pole arms much but I would expect they are much slower than one handed weapons. I did give a 2 handed axe to my first rage and ran him 10 activity level and he got jumped constantly before I sold him off.