The way I see it:
Swordsmen
Pros:
Ability to counterattack.
Large variety of skills.
Cons:
Base damage of melee lower than Spearmen.
Base health lower than Spearmen.
Having no ranged attacks.
Spearmen
Pros:
High health.
Base damage of melee-high.
Having ranged attacks.
Cons:
Inability to counterattack.
Only three skills at disposal.
Post your ideas!