Which level 2 creature is the best?

Take a closer look at the polls on all topics; I'm not sure you'll agree with them. Many people prefer things based on appearance or something else, rather than tactics and abilities... As for Storms, I meant that they are useless during a castle siege, unlike Harpies. And stats don't necessarily mean that one creature is better than another; consider all possibilities.

Hmm... Harpies are better at sieges than Storms? I'm surprised. How did that happen? :)
I already understand that you have a preference for Harpies; I, on the other hand, prefer Storms not only because of their stats, speed, and the fact that they are ranged attackers, but also because of their "usefulness." Let's consider your example of a castle siege:
So, you think that Witch Harpies are the most tactically advantageous in this example, right? And Storms can't defend the castle? You'll probably say that if they fly up to the Storms, they won't be able to shoot, etc., but Storms don't have a penalty in melee combat, and not all Harpies will reach them, plus their retaliatory attack can be useful, but Harpies lose at least 2 turns (a normal turn and another to get next to the Storm Elementals), which can have consequences...

I always consider the maximum number of possibilities. Storms tip the "scales of power" in their favor in the argument with Harpies.