The Archangel remains the strongest creature in a 1-on-1 battle for me...

But how often do you encounter battles in the game where heroes have equal primary and secondary skills, no spellbooks, and only level 7 creatures (in equal numbers)? Of course, not very often. So, maybe it's not that important?

This is a thread about comparing creatures, and if you want to compare armies, create a thread about comparing armies...

This thread is about comparing level 7 creatures, and not just 1v1 battles between them (many bonuses are lost in this case).

For example, the Chaos Hydra loses to many level 7 warriors, but you can't forget that it attacks multiple units, which is very useful in normal battles (and not just level 7 against level 7). So, it's stronger in some cases and weaker in others.
The Titan, for example, is a good ranged attacker, but it won't be as useful if the opponent has the Tactics skill and/or fast units.
The Black Dragon is more useful against a mage opponent than against a warrior. (I think everyone understands the reasons)
Dragons can attack through (hitting two units), but only one responds to the attack. Therefore, in a battle, it can happen that the dragon attacks a unit (let's say an Archangel) without receiving a counterattack from it.
So, the situation is also very important. Different level 7 creatures are important in different situations.