Which level 7 creature is the best, and why?

In such an example, with equal hero stats (specifically, 0 in both morality and luck), the Ancient Wonders have no chance, IMO. The number of lives and abilities don't stand a chance against the Archangel's turn priority and the unit's stats.



Second place goes to the Black Dragons. Archdevils are unable to defeat them in a 1-on-1 battle, and Titans also can't handle them...