What is the relative strength of draconian's colors?

I know that pre-rework pale and green draconians were highly acclaimed and black draconians were deemed too weak. What about the new draconians?

The farthest I have gotten was with a black draconian and, I must say, they are anything but weak anymore. Their breath weapon arcs to every adjacent creature making it extremely efficient against e.g. v:5 welcome party.

And then we have the boost from in the dragon form. Two-shotting uniques with what is basically an evocable? It’s more likely than you think!

How do other colors compare? What is your favorite?