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In my opinion, it's roughly like this:
1) Earth Elementals, Gnomes, Orcs - practically a guaranteed victory.
2) Demons - the army grows by 40% (sometimes more) in no time + arrows are blocked. This is also a serious claim for victory.
3) Air Elementals - good additional damage, and when the forces are approximately equal, it will tip the scales in your favor.
4) Mages - not bad, but nothing more. They don't have mass spells, and all their development is "crippled."
5) Necromancers - it looks beautiful, but there's little point. The probability of the opponent's turn being less than 60% is low.
6) Humans - absolutely useless! It would be better to make them like Necromancers (but in reverse) - a super prayer that increases morale by +6.