Knight use 2 swords and put all extra points to armsmaster. If you duel wield sword you get 2 more damage per point of armsmaster. With Sword/spear each point of armsmaster only add 1 damage.Minotaur use 2 handed axes. Split extra skill points equally between axe and armsmaster. Axe and dagger combo doesn't work very well
Vampire use 2 daggers and max dagger for damage and increase critical strike.
For dark Elf 2 swords don't do that much more dagger than 2 daggers. Even if you give them the 2 sword relics it only does 20 more damage per hit. Sword/Dagger will slow down your attack speed as well. I would stick with 2 daggers and spend any extra skill points on other skills.