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I played separately with:
1) a completely dwarven squad (Master, Hero, Priest of Light, Archdruid) - a pack of invulnerable terminators, healing and supporting each other.
2) a completely elven squad (Ranger Lord, Master Archer, Archdruid, Archmage) - these guys aren't as durable, but they perfectly fit the saying "float like a butterfly, sting like a bee."
3) a completely goblin squad (Black Knight, Villain, Ninja, Sniper) - they performed best in battles against the Krigans, but I wouldn't say it was always easy, as they are weaker in magic and their magic is mostly for support.
4) and a completely human squad (Black Knight, Assassin, Priest of Darkness, Lich) - this is the "gold standard." Each character is the best in their role, and together they form a balanced team.
Yes, I voted for the dwarves.