Of course, Order is good against Nature because of its ability to banish and remove enchantments, meaning we're not afraid of summoned creatures, and we can also remove positive effects and apply hypnosis, berserk, and even blindness.
Life has a decent chance due to its protection and the ability to remove all positive buffs, and the Song of Peace is also effective, but the game will be more challenging (but life is like that – don't get involved if you don't have the skills).
Chaos, in my opinion, has a good chance; it can burn everything, including the army and the hero-summoner, like this...