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No way, Chaos Dragon! 8-)
This is 1 vs. 2 or 4 (champions)!!
The strength of the Chaos Dragon lies in the fact that it doesn't lose attack and counter-attack power with damage, unlike others. For example: If you have 4 champions, equal in strength or slightly stronger than the dragon, but with damage, their number will become 3, then 2.... and that's it! The attack power is halved, and the dragon, which was mowing them down with 400 HP, continues to do so with 50 HP. This applies to everyone! Also, it goes first and flies very far... It's really tough against Titans! Yes, they have a ward, so what?! That means we wait one turn, take our 1/2 damage, or even 1/4!!!, and then we unleash on them with two attacks in a row! 8-) And when you have only one Titan left, it will be very difficult...
Now, regarding the most useful ones... M-m-m... For Order, it's definitely the Dragon-Golems! In combination with Golems and Genies, it's just devastating! No counter-attack, first strike... Angels fly in, but they get beaten up first! And if there were 10 of them, there will be 8, and the attack is no longer as strong... then we give the Angels a beating without a counter-attack! And then we beat them up again when they want to attack! 3 attacks at the beginning against one!!!!!!!!!!! If you play well, you won't lose an army at all with the genies on neutral grounds! And if you do lose, lower the difficulty level for the champion. ;-)