Spears/pikes/halberds. Especially the halberd. It let's you stay far enough away from the enemy to avoid swords, maces, axes, and yet you have both the hacking ability of an axe, and you can penetrate armor with the spike. You can also use it to deflect blows, and hell, if they cut it in half you still have a spear/axe hybrid. The only disadvantage would be the loss of a shield, but I suppose one could have a shield strapped on their forearm.