Well, that's true =) It's a matter of taste, as they say.
But who would be interested in playing on M and S maps? Maybe there are some, but I prefer XL and L – there's more room to maneuver. That's why I usually play as Chaos and consider it the strongest. And if you compare the Black Dragon with other creatures of the same level, it's the strongest. IMHO.
If you're playing with another person, few people play on large maps, as it takes a lot of time.
If you compare the Black Dragon with others, their growth is less. The Black Dragon doesn't have much of a chance against Phoenixes and Titans.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!