Which level 7 creature is the best, and why?

I agree with that, but there were also cases where the opposite happened with a Wonder on 1v1, it was rare, but it did happen. Because it has 80% chance to bypass the enemy's defense and 300 health. I'm writing as it is, I'm not exaggerating anything.

Added 5 minutes later
Second place in 1v1 would go to the Archdevil with its unblockable attack, it takes down both Titans and Dragons. And in general, the Titan is also good, the Black Dragon is definitely better because it has a hatred for it, which allows it to hit harder, it shoots and has a lot of health, but in melee combat, the Archdevil is better.