Freeze
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Non-upgraded Titans are useless creatures, but upgraded ones are the strongest and deal additional damage to black dragons!
Archangels are only useful because they can resurrect, but otherwise, no. If you have a large army against you, you can try to take out the strongest one, but then another one will attack you, you'll respond, and then there won't be any more... But dragons, for example, can take out several enemies with their fiery breath, and Archons also have a bonus against Devils.
I don't know about you, but in my ranking, the Phoenixes (both types) and Devils (both types) and Skeleton-Dragons (both types) are in the last places.
Archangel is strong and can resurrect.
Monster breaks defense.
Devil is fast and attacks without response.
Hydras attack in a circle.
Black Dragons are immune to magic and fight well.
Titan is tough, has a decent attack, and also shoots.
Each unit is useful in its own way...