What is better in a 1 unit army - 1 red or black dragon

[Zechnophobe]

Black dragons, barring a slightly higher attack, only do 5% more damage per dragon than reds, but reds cost 500 less leadership, so you'll have 25% more reds than blacks. That's the reason they do more damage. BLack dragons have 130 more hit points, and higher defense. They also have more resistance to magic and physical. So for a single unit, the black dragon is a good deal stronger.

The main difference in survivability comes from the black dragon being unable to be healed or rezz'd. You can stone skin a red dragon to give it a lot more physical resistance, you can't with a black dragon. You can fully heal the red with level 3 heal.. you can't with a black dragon.

Anyhow, I just want to set the record straight on this.