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I checked the box for the dragonflies because, in my opinion, this unit can work wonders. You know, I'll never forget how one Pole cursed when, in a battle against him (on magical terrain), my dragonflies, with one strike, removed all his buffs and, to top it off, inflicted weakness on him... mmm +))... And so, I believe that elves are also very tough, and griffins too, but the latter are just meat with resistance, and that's it. Of course, dragonflies aren't as powerful, but sometimes, with skilled hands and favorable circumstances, they're simply awesome, and they also have more speed than all the others...
I agree, sometimes dragonflies are very useful; speed + the weakness spell = cool :-), but dragonflies chronically lack bulk, and IMHO, they're not very suitable for the role of the best unit.
And in skilled hands, the same cerberi are good, and golems too (although I don't like them, but a lot of health + reflecting magic is also an argument).