Club. Seriously. It's the first weapon that I get in my early games(from looters) and I only get rid of it once I get something really killy; from knights or other elite troops for example, or if I get something really nice from bandits.
Anyways.
ranged weapons:
thrown - rocks; faster, more accurate and with more ammo than anything else. While not a killer, it's definitely a good disruptive weapon.
bow - strong short bow; same PD req. and similar damage to strong bow and long bow while being much faster and lighter. MW short bow is also something pretty good(the only faster bows are the hunting and MW hunting bows).
crossbow - not much; light xbow for horseback combat; for sieges, the more powerful the better.
melee weapons:
short and nasty - clubs, maces (balanced flanged mace/spiked mace), the best weapons for use with a shield.
twohanders - bastard swords, 2h axe/2h war axe, morning star/iron mace, spiked staff. being 2h weapons, tho, these all need to be balanced and with really high proficiencies.
polearms - awlpikes, hafted blades. light lance can double as pike so it's a good weapon for both foot and horseback combat.