Which monster do you like the most in Heroes 5 at level 7?

I played with the Crystal Dragon of the Elves, and it didn't impress me much. Honestly, I'm not sure if it's better than the Emerald Dragon. The Emerald Dragon has Acid Breath and is stronger in terms of attack and defense stats! So, I haven't decided which one is better yet. Maybe someone else has already decided? Share your opinion! By the way, I finally got to play with the Red Dragon, and it's a cool dragon. It deals massive damage, and its burning attack is awesome. It's a shame that only magic affects it. But now, you can also cast Light magic on it!