Which is stronger – a titan or a black dragon?

Theory is good, but practice is better.
I spent almost the entire evening compiling more or less accurate statistics. I tested heroes with zero attack and defense, using the Hourglass and the Spirit of Despair on sandy terrain. No special maneuvers or complicated tactics, just a standard statistical battle, head-to-head. 7 battles each, one on one. So:

3. Titans obliterate everyone without a chance, slightly losing to Black Dragons and getting completely crushed by Archangels.

1. Archangel is the undisputed leader, defeating everyone, except for a 2 vs. 5 match against Behemoths.