Something to keep in mind- everybody loves that heavy cav retinues like Knights and Cataphracts can take armies about twice their size, but that's because they cost twice as much cap. One heavy cavalryman takes twice as much cap as a heavy infantryman, pikeman, horse archer or light horseman and four times as much as an archer or light infantryman. Adjusted man-for-man they're fairly balanced. Just keep in mind that after you take cap/numbers into consideration, the biggest impact troop composition has is on what your army's best at. People love the English Longbow retinue, for example, because they're incredibly powerful in the Skirmish phase and can sometimes win battles without having to go into melee and saving both time and manpower. Scottish Schiltrom pikemen have huge defense, especially in melee, so they're tough to kill and can prolong battles (good if you have reinforcements moving towards them, bad if the enemy has reinforcements). Stuff like that.